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SECURITY

MARKING

The classified or limited status of this report appliesto each page, unless otherwise marked. ,-Separate page printouts MUST be marked accordingly.

THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OFTHE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE LAWS, TITLE 18,U.S.C., SECTIONS 793 AND 794. THE TRANSMISSION OR THE REVELATION OFITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHIBITED BYLAW.

NOTICE: When government or other drawings, specifications or otherdata are used for any purpose other than in connection with a defi.nitely related government procurement operation, the U.S. Government"thereby incur.s no responsibility, nor any obligation whatsoever; andthe t4ct that the Government may have' formulated, furnished, or in anyway supplied-(the said dreawings, specifications, or other data is nottO be regarded by implication or otherwise as in any manner licensing-the holder or any other person or corporation, or conveying any rights

* or permission to manufacture, use oqr sell any patented invention thatmay in any way be related thereto.

114.¶

I I I

j i

\J ( L ~ A IVULA FIE NW TP 5095C_/ GROUP

0owagraode at 3-y oritrvals; /copydectassifi@4 chat 12 Yeats.

FAST-.BURNING RATE/HIGH SLOPE PROPELLANT00 TECHNOLOGY PROGRAM

SECOND QUARTERLY PROGRESS REPORTI August-31 October 1970 -

(U)

'bvR. I.. I on and A.kat z ik ianAero jet (encrail Corporation

for the

S ABSTlRAC'l . (U) 'I'll! i s st li second, qurt r k) progrcss- re portI ontrk c onduc ted to advance s tat e-of- the-art wi th rega rd to tormuo iation (ifpr II ti1cal fis t-btirn ing and hiigh p rossulre-i xponen t propel Iant" . P1r! ma rv~~'liisiswas directed toward opt in!zat ion of tile processing, miechanicalI

ýZd ballistic properties.

(U') App roaches to fin 'p rov ing p)ropelIlan t p) rtc e.,s ah i Ii t v inc I tidedar iat ion oif amtotunt and tVype Of p stizer*s ot b locked or hiinde red

focyanate (curing agents,, evaltiat io oi' of epox id' ('tring agenlts and imod I-j ic-"nat ion of R-4 5> p repol lL' mr . Thol'1as ;t app roach was, fouind to be by far

the mrnos t effectivye, and sat is facto rv r rocess abiliitv can he achitIeved wi thpropel lan,11tS meeting the des! red ha I list ic and nlechicla tI properties.

J-

V~J 1 NAVAL WEAPONS CENTER -~\ W~i ,q CHINA LAKE, CALIFORNIA* FEBRUARY 1971 -

DISTRIBUTION STATEMENT

IIN ADDITION TO SECURITY REQUIREMENTS WHICH APPLY TO THIS DOCUMENT AND MUST at MET, EACHITRANSMITTAL OUTSIDE THE DEPARTMENT OF DEFELUTHV RO PRVLO H AA

We APONSCENTER.Lý USHAEPIRAPOAOFTENIVL

Reproduced From UCASFEBest Available Copy

UNCLASSIFIED

NAVALL WEAPONS CEN TE R

AN ACTIVITY OF THE NAVAL MATERIAL COMMAND

W. J. Morkatt. HAM. USN .......... Commander

SGi. WIlOh on....................................... Te-hnleIl Director

This second quarterLy report describes progress durAng the period

I August through 31 October 1970 on Navy Contract N00123-70-C-1457 to

Aerojet Genetal Corporation, Sacramento, California. This work issponsered by thle Nava W�Weapons Center (NWC), China Lake, Calif., and-

supported by the Naval Air Systems Command under AirTask A3303300/216B/

iF 19332302.F. M. 1.ickett of N,' is the technical coordinator and has reviewed

this report for technical accuracy.

Released by Under authority of - -

R. A. MI LI.ER, iioaJ G. W. LEONARD, iKadr:,.', ,;~ :•o•: *';,i: t.,'• / i ':,2 or,•i',z a ~ Z; cz'c ZQPo t I?'c ?xjp'atmen t15 January 1971

1-(1 Techinical Pubhlication 5095 "

Pub lished bv ............. .Propulsion Development Department

Collation ............... COve, r, 13 leaves, DD Form 1473, abstract cardsFirst printing .................................... 280 numbered copiesSecur i tv c l assi f i cat i on .................................... CONFIDENTIAL.

Abstract alone ..................................... UNCLASSIFIEI)Title alone . ......................................... UNCLASSIFIED

SECLURITY STATEMENT

tryfN ')N1 Jý 141.ILPyA tI 'pj Aff T 1 -4 tf! NA14 A 1 W IIN At P F O THE oNly F rTAT f ,1T H4IN THE MF ANIN

UNCLASSIFIEDNINV TP 5095

CONTENS

Introduction .

Obj ec t ive................... .. .. .. .. .. ..............

Sumrnatv..... ............................. ....... .. .. ....

Technical Discussion............................. ..................4

General Approach......... ............................ 4

Processing and Mechanical Properties Study. .. ................. 5

Propellant "'A" Ballistic StudY....... .. .. ................

Propellant "B" Ballistic Study .. .. ................. 17

Propellant "B" Hazard Test,,...........................17

Liner Aging Study.... .................... ....................)

Wc.rk Planned for Next Report Period .. ......... .................. 21

UNCLASSIFIED

UNCLASSIFIED%VC IP 5095

I::TRODUCT10N

(U) This is the ssecond quarterly progress report pres-ented to theU. S. Nay Nattal Weapons Center, Chinma Lake. California, for Wotkconducted uinder donmtract NOOL013.70-C-l457 for the period 1 Augfist 1970through 31 October 1910. A g savof tt rms and at) rev iat iots Isprovided.

OBJ ICCTTlVI:

() The objective of this 10-month programn is to adv~ance the state-'of-the-ait w IthI regard to formuilation of pract ical fast-hurhing andhigh pressure-exponent ~propellants by e-kpanding available technology.

(U) The research performed will provide the capability~ to formulate -two propellants, hlereinafter referred to as' "A" and "B", withrespective burning rates of 3.5 and 7.0 in/sec. at 2000 psia and apressure exponent for both propellar.ts of about 0.70.

MU Both propellants will be formulated to deliver a specific impulse'15

(116000 of at least 240 lbf-sec/lbm with a density of 0.0 1 3-0.065

lbsTie study also includes the dlevelopment of adequaltemechanical properties to withstand the temperature range of -40 to

10f. ther considerations ire adequaite processing, potlife (4 hirs.S135'17), thermnal and aging S tabl[rIity and safety charac~teristics.

Only composiepollat are being consildered * with porous AP' (PAP)

and non-voltile fertocene dlerivatives limited to the high burning ra tepropellant "W'.

(U) Prim~ary emphasis dut ing this report period was directed towardioptimizationl of thle processing, tncchan lic)Al and halIIisti c prope rt ie s ofpropel'lant "A". A lesser effort was; ex.pendcd onl propell[ant '.0'B s inkcprogress, made on "A"V was readily appIlied towards the opt im i!at ion of

() Approaches, to Improving propel lant procevssab lilt Inclu tdedvar iat ion of a3moun t and type of pl as tic ize r, uise of 1)1ocko 1 or hiEnd red-isocyaIa te curing agents,* eva tiuat ion of 'pox ide cuiring ageli t s andhmod ifi[cat ion of K-4 5M prepo Iymer . The last approach was found to beb)y fari t Ie io s t e f f ect vec , a nd( sat i t sfIie to rv p1r oce i s ib 1) I it vcani heachieve(I wi thi propel lants meet ing the destred Wi! 1 ist Ic and mechan icalproperties. St-I ect ion of the final canld ida1tes haIs been postp poneduntil thle next report period duie to a one(-monthi prograim eXt ens ion

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UNCLASSIFIEDOCC 0W rP 5095

(u) 'Ile usýe of acetylacetone and triocitvltpiisphline oxide (joPo) to,resit'ct ive ly, block 3an'I dimetize the TiJI in ,;I u by adding them to thepropel llInt prireix did not yield any increase i po t I i f c lmi:ri:~ed IDlIwgas p repared andl uIsed in sey,'ra I bat obo's An Adequate p, if k. wasol'ta ililcol * bt thek c'ure'd propel lint was tooo br i tle. Furt her work- withthis vpateri al ,:as discontinued.

(U) :.ed oox' / ocyana tte curing agecnts vi I led Some encouraging,resltSin :*:ondingpiopt-I lant p!ift', but f. ii 0 d to provide

sýit isfactorv cure,,. In all 1 * f divjpoxide-S we're , a OLVa1.te'd .1nd werefound to either prov~ide fair pot lives anld Poor cures, or poor pojt I%:l.iveand brittle cures. It wals conicluded * there fore t~hat the use of

enx de *alone or in (combi nat ion W it LiM dL [not prov ide sigifcant

(I*) Phe re.p 1 ce-ment of the Oroniite. 'o.wItoo ill 'I resul ted ill a sorlewha~tmo'rt- p rooessab I propel I ant . Hioweve r, 01 tlecur d propl1ant Vie IL ddpolorer r.cclizii cal and bal listi lorueprttos, thai was achi eved wit Hi roni te6o a s the pati ci i.tr . ';o fiirtiior altteMpt was r ade, to use. D11), there~fore,heopi'-ev the prooceLssl ing improve,:eoet it provides is more than offse~t byits, oleterlorat ion of other propel lint propertit -

( ') Ui ng Orooni t L fi is t he 1 1l1s t I co /e r , a n ;1 tterpt was made tooi:'provv pr0oot55 ill- no 1 0ol 101reb'-h ncra>1 pot I i f 1 b% I oowe ring the K-45M!

to stoiclijometrioni I'. match the IlDI Io-ve I wmaI' i lg lip tie oIh f f crencewi tho ph as! ic izcr. N.OS ign! f i Cant g;ain1s In pot I! if 0 ' we re a co loved,anid booth lo,il I I it ic 1ii1d MediaI ica CI1 )r opeLr t ie42 sjf ferord.

(U) lle addoIo t ion of alumninum near thet endi o) the mix cycle ratherthan11 at thie' bog inni ogl was Invest isated to dIt~erm me if its, presencein the I onlt interim niix cvo ho hoad I v prioccss ii , niecloan ical proopertyVo r ball Iistic effects. M!inoor effteots wreolbsorvyked 0il ballistic andmechiaiti ial poroopert ies , but noot oin lroocoss ing . 1a nooolorat e irolrover~enti n roles sing, hioweve r, was lobservtid whito a p re'vi ouiusy iuoopeneod oantiofthe current ILot of P-45%! waLs llso'oh. hoe improve Ment inl proick-SS1) %,g,'ISa-wior o'lw to less, ox idative o rooso, ink ilog ill the one l .:hooýSeol R-45X.

(W) L~owe'r 1hoaI list I c so .)Iol (s werec inve's't i g,'tedc a s a means t o imrove'ho t hIi [roces s i ng a nd vic cha~n I,-i oII r p-,; r t I "s -Al toi oiigh i rirprolVoren t s-.were soo n i n thio's e a reasi-;, th ol sa cr i f I ct i n b)i11rnli i r ra tek was t ooo g rea tto se-rious lv cons idter thiis approaoho. A pro-Aisllhg ;ipprcoichi, hiowe'ver,towards im'proovinog propel lant VtoltIi ft WAs aChiejveOd In io si ng arioo I If ieol1 P-4)M. S uoIvnfioatit i norea-o's iii po-tl I lfe were achiuIveolw it tlIitt le ohiiogt' inl rikchotoincal. lropt-t it .

(U) A series, of thoree' bat hio's wore prepaireol vary in)- tho 1'17l f room.4 0 L-0 (11 val louts Vi (o'0S i t .% Ill I I lip and mnedian ic 1n ) PropLoert v dat andIitiol ltte hproplor 111I)1 'qu i valI ilt~s I iie loot-tween 53! ando 60. Hoowever,

hili'vhr 'qoiivalo'ts; levo' s oof [I'Pore requ~ire -d as the OD)11 lovel IWasI ro plolooo . lb is wais ;hOown ini a so'rio's of thiret' hat ches whici h were madoe

o UNCLASSIFIED

UNCLASSIFIEDT~ P 5095

to further sutbs tant late the need for and estab iIsh the des ired levels

of IWOh and TEA in the forruilar hn. Ihe data ineicaite that the besto vv raIlI p ropev rt It's at,? .' ~Ic I ie ved w,1ith, hobLt! I present , andlh that t lit propv t11Ib e'' I ivs between 65S avd 7R tQiuv. in a svstt'm where the R-!,5M1*.ve 1 has ben rais;ed biy 10 cqui va 1ent s

(U) ~woother :etlhods of increa-sing thltburn lug r'ate of' propelltantA" s"'re AUValoated. I he first :'ehdcols~is't" (iof aidingi I flunorine''onltain ill, plastic i~e (er of a-ti.lle o c aid With 1, ,-ti

li'',r~.'x5 1.,iflorl nonno )to the propel lint in-placinug Iml f of theplast L i;cr . 'Thet rOSul t ug, corlposhit io proizesstd wi tl diiff Icuty andk:u re d to a h r It t. Ie p)ropeI ,l at wh ich co uI J! n ot ble testedI for bu~rninsgrate. ihe s;ecund m.'tliod invllVeId preparing, all add itijonal batch of

p ropell Iant ".-%" Inuco rpo rat lug two pe rcen t of ,he g rolund fe'rrocents,form.:alde'hViio poisMmer previous Iv' evaluated at 0.5, level . No signi ficantburn ing ra~t e inc roast w,).s achietved , and p roco ss~ili 1 it v was severe!lycurt ai lot,!.

(u) Soev 1-:11si onl i f i cant ir-p roveelit s we rt' Madt' in inc rea~sing thleburn inv rate of p ropell Iant "'A' . 1ie ron I A"Cement Of tilie I ron ox:ide,

previous! v used 1'.' a cry'stal line red iron ox ide provided I'y NavalIGn;pons linter resil td in a ST increase in burn ing, rate at `0001

ps Ia . A i j~nc rome wan~ r~ealizcei by thet repLacemen-tt of 19,' YýA Al'(1.)withl 3.. lUFAP and ainother 7 incit reas;e by dou il ing tile mix. ivv le to

1 ors 8, y c o mb in lu1g the se fa c to rs a so!I id strand burning rateof 3.62 in. /,ec at 2001) ps i ws achl i ''\'d . A repeat hatch was maideto cunf rmn this data Mliiih MIeIe ai luver bunin ate of 3.4 In/ýs c

'{00.) psýi a. ilt -reason for tlt. rate drop is unknown.

() Pep I akol ng, t fit, 0 1 d Fe 0 md 11 o-S comb i nat leon ent ire!I v wi th tlier trystalIlint' Red he ,,j)3 galvethe h ~m irnimg rate' at -20001 ps ia. A!I s,(I

rep lac ing t lit a 11 Mrn p0%.'dt' r Wil f1It h lagn' sinn po1Wder anld a f, 5/ 35flgu'sI ':a un ~mmall oy. pow'de'r svlvs sellt ia I ly no change in

* hlruin'.l, ratt' at 2i)0) ps Ia.

(U) A new lot of YENA' (01.55..) w ~-, vnyaluatel In the s.'rlts whereI PI)I w'a. varied froUm * ) -f-5 rpi) lu Tlie bui (no11 rattesr''.cti.'

tw-re 3. '8 , 3.31) a nd( 3.5-1 in/se' at '000l psimi. [Tlie data Indlicate acorr.' I at io ofl( hi rn lung ratt'e .i th !,-r it hi : odihni n's, IPIllI or un reactedhydro::vy Ioti Ni. f i rm conichus ion can he madle with tlt' I im It eil iat acurrentI''ly imila!blt'

() A srm-I I alililli o f a litw lot of st al I juI It 0iF recti veid from -t i )- I Is~dink

;W(: was-itva I iimt't! a Ion)' .,ith a lit's l-lb) lot purliso fro'm FranC'. Davit; Companv wviliCli l'IS llýtCl isý receilyed! and after grinding fortwo hoilirs . NO cin' inll r Ilfligl, ra to ,,:cre ohice rve'i wit hi tlt' miugromindsa-ipi eI k,- bit t I it, g rutnIl r. mit or I a I t ',i" d a S i east'. e c

UNCLASSIFIED

UNCLASSIFIED Cdo V C 0 CCC~ 'ttl 1'JP 5095 oC CoC C 0 C CCC

(U sAerito:; of propellant ""b~acchecs were evaluated in which theeatucent, loevel arnd oxidizer ratilos were varied. lie des ired burningrate was eXCOede'd ait a Catocent: level of 42.- The ox id i er mod if icat ionsat 3'. catocene fell sihort of the- burn ing rate goal.

(0) S fetV tesits re2vealed that the propel1lant "81" fo() ri tIla t Io Icont aining C at OCene and having a 74' Shoe t "A", ha tdne ss , has hiighZrI ioton sons i tvi tv li .2 a bait ch corita in ing 37, cat OCV1ne anld

hivl '. lg a 30 Sho''re 'A" hardness, showed imp roved sta;b i lit v to fri c tion.I t ha:; not aenHsos-sed whet he r hardness or cat ocene Ii.eve was

resnos. l~Ie for the high friction sens it ivity,

() A DPT I'spec f!:e n u t il 1lzu g t le 4 34-4 1 1ine r reno r te0d inT t hek f irs tquarter]. reopert was tested after beving aged Onle m1on~ti at 135'F. l[he

resul ts !shove td that the I iner-pra)pe IIant boind remai ned vex'ce~l lnt.I t is planned to use the 43-,+-4 l ine r for tli is prog rai. and no f urther

I titer w',rk is planne-d.

TJ'Cl!N CA. DI SCUSS ION

GE.Nl;RAI APPlROACHI

0. T he pr inc ipal effort during th~is report period was d i rec,' tedtow~i rd i noc rods i nug the pot i feV and bur iirtng rate of prope I1 ant ''A"'.hInre.-ised pot I i to is necessary !in order to successful ly scale.-up

Ii.- propu.k I I ant batch size And cast the- requisi te number oif grainsto f it I f illI the cent rac t ra I rL'(1u 1 remont s . Part icu Ia r emphas is was

plae o im improving precessabil1it>' by introduc inrg varibous hindermod i f ic-at ions.

0') Se.ve ral attempts were made, to extend pot l ife by inrib ii t imri

15oc.anat e g rmups w ith a rove rs lb le 11) lock i ng igenit and] by us, ýirigepo.Xide ; alone or iii comb i nat ion with the di isoc vanate IPI)I . These

vpo~xides ranged f rom d !icV( I OalI i phit i C to d ul Ia i ph-it i c types to determineti heoffect of st ructural changes . As part of the i!;ocvanate- inhit) ii t Ioil

approach, dimorized [Dl tvas prepared and po. ified prior to incorporat ion

into prolpelI larit . It vas hoped that reversi on bach, to monomer ts'oil d beslow enough to yield pot life adlvanitages.

(W) IN,1 was- used in p1lace of toror ite 6 to t ake advant ag'e of its

lower viscosi ty as a mneans to lower the propel 1lant vi scos ity. Al so,tht. II'D I concen trat ion was, reduiced for ain opti mum hal ance betweenlpotlIi to and mechari i cal p rope rt ies . OthIrer app roaches ovaluia ted( forimproved p'rocessab ilIit y inclIuded increas inrg tire roi io( t th expes(

oif R-45M. further optimi zat ion of the bonding and wetting agents,* and--mod ifi1cat ion of the R--. 3> prepol- vmtr.

0.) The burnilng ratoo of both propelIlarnts 'A'" mrd ''W' were miaximiz-ed,cormerisrimte withi good processab 1 1it v arid( mmi:,*nur~i propel Iant hazard.

4 UNCLASSIFIED

Q.

UNCLASSIFIEDNIXC Til 5095

t vmprovig the butnlng rtate. catalyst. uisin~g finer oxidizer' blends.and extendilng thle nix cyl other appro~aches consisted of replacingaluminum pow.der %with miagnesiumn powder and partial ly replacing thlepla~sticize'r with a fluorocarbon plasticizer which had given hutningrate inc reases in other prtopell1ants.

(u) ~ r! n(,i pat Iv the work t" inc ro:r',e onr i rates was directedtoadahievin te35in/see burning rate goa: at 2000 p. i o

propell ant "A", hilt, As was previously-, de2M0ust rtetd, imiprovemnents inthe hal listiP2. properties of 'A" could be readily adapted to meet ingpropel lant "B" ha li-;i sc reclu ireiment. Co (.nsequentlIy , fo rmulat ions furpropellant "B"' were evolved by mak ing riinor mod ificat ions in thle "A"fo6rmui II i o ns . .

P1ROC : Ss 1; N(G AND MECHIAN ICAL. P ROPE:RTI1ElS STUDY

(U)~s friu unucesfl ef forts to increase tile pot life of

propel' ant 'A'' wore based on me tiodF to hilock the I socyan-ito reactivityci tor hreat ion wi iii pheniol or bY *lierztinwth the d imerizat ion

catalyst tr ioctv Ipliosphirnc oxide (TOI'O). Fai lure to achi eve thledesired potl ifeo inc rease for thle first approach was at tributed to thledi ff icul tyv of the al1iphat ic dli socvana to [I'DI to react withI phenolIin thle abs;once of a catalIvs t who vreas thre second approachi did not workprobahbly duie to ina.i t f1'Ilt mrz On the other hand,a romat ic di isocvanates suich as TI)I read llv react w ithi hvd rox-v bearing"compounds such as plieno I ; also are read ilv isolIable As s tahble dimers.Consequiently, ýthese tvo block ing teclhniques were again attempted usingITI)T in plac Ie of lIPI)1. Thle tittliod used in tir I case was to comb ine the:TDIl with thle blocking or dirneriz lug agent 48 hirs . prior to incorporat ioninto the p rop~ellIant. v [ie blocking agent used Was acet viacetone in placeof phenol to provide a more road[ily reve rs ibl b hlocked isocyanat e, andthe dIme~rt zat ion catalyst used was TOPi) at a le-vel equal to f if typercent of the isocvanate level. T~he appearance of finely dividedsotlid materi[at was taken a,, evidence in hothl cases for thle formation ofthle des ired Vlodified isocvanat e and no further anal vs is was attemnpted.These modif ied. TDT ml xt ores were thlen incorpo rateýd into, theý standardR-45M p ropelI [anlt f ormulI at i on . hat vie t Iled very sho rt pot l ives

-Apparently tihe blocking and dirieri z in.4 react ions, dlid not proceed farenough he fore inco rporat ion In Lu p ropel11ant . No mechanical or hall Iist icpropert ites were Measured on thI ese 1,rope I I a nt s . Al so, no furtherattempts, at forming hilocked lsocvaniates were made duringtiisrpt

period.

() A final vaIluoat ion of thc valuec of the dimer approach to0Increased pot life was mad~e (Table 1,:.~5)t1, -4-41) byutsing the putrified diner of TI)I as Lthe curing agent in pl ace of 1111)

UNCLASSIFIED

UNCLASSIFIEDccCC~0NC Ti 509.5 6c

The diner was formed by blending I mrole of TDI in 5000 rl toluene with*5 drops of trl-n-bUtylphosphine as the catalyst. Tile mixture Was

stirred overnight -ind the resulting solid was collected by filtrationand washed we!ll with hexane.* Thme vacuum dried material had an m.p. 'of154-1350 C ident ical to the l iterature vailue. The I.R. spectrum wasalso in accord with tile expected dimerized structure, giving a stro tgisocvanate ahsorpt lot at 2280 cm ý and a strong, urea-4like carbonylabsorption at 1772 cm-1 . The propellanmts made with this material' ga vereasonabhle potlivos , but cured rapidly to a hard, brittle materialwith apparently poor mechanical properties. Since no great advantagein pot life was demonstrated (Figure 1, !/AK759i-,74A), and since thleresultant mechanical properties were poor, no further work was donewith this material.

WI) E~poxide anid iimline curing agents 'wete evaluated in this case tosee, if the, catalvtic nature of thle propellant solids could promoteeither the imine- or epoxy-iivdroxyl reaction. The diimine EISA wasused first, but failed to give any potlife. It cured the propellantrapidliy to a hard, brittle mass. 7Th.le use oOý the diepoxide vinyl-cyclohexene dioxide (ERI.-4206), which was evaluated next, resulted ina 4 hiour potlife at 135'F; thie material gelled but failed to developa satisfactory ci astomeric cure.* A reasonable cure was achieved,however, by replacing one third of the ERL-4206 with IPDI (Table 1,"~AK759 1-13). Al though this shortene(2d thle potlife to two hours, it wasstill estimated to be two times 'that with IPDI) as thle sole curing a ent.Potlife was taken as time to 50 kpoise at 120OF and 10,000 dynes/cm2

shear stress.

(11) Since ERL-4206 contains two kinds of epoxides, aliphatic andcycloaliphiatic, it was of great interest to see if thley n'haveddifferently from each other in their reactivity with R-45. Thedlcvcloaliphatlc epoxide ERL-4221 Was therefore evaluated in anotherbatch of propellant, resulting in virtually no potlife arid a rapidcure to a hiard brittle propellant practically identical to thatobtained with the imine RISA. Th~e Indication is that there is avast difference in reactivity between time two types of epoxides, butit is not k'nown whether or not thle two types undergo different reactions.

WI) Time use of various epoxides in combination with IPUI as a meansof extending pot life but still achieving an adequately cured propellantwas evaluated further. In a series of three batches, (Table 1,I#Al,7591-24C, -241), -24E.) the IPDI was formulated at 35 eq. alone and it,combinat ion withI 65 equI ivalents each of reso rc inoldig lyc idy e ther(C-1,1A HER 1 3-)() an1d vinyl cyc Iolexe~ne dioxide (Un ion Carbide ERL-4206).Tlie purpose of using IPDI alone wa.,- to determine whether or not thecures seen with the II'1)I-epoxy combinntlons were due only bo the IPDI.Thle shore hardness data Indicate that the epoxides used do contributeto thle cure. in it ial v~scosity as we! I as; buildup with time is greaterwhen 420 2Oi nd HIM) are, mixed than whien HIM'l was uised a lone (Figure 1.

6 UNCLASSIFIED

CONFIDENTIALN�4C IP 5095

'-7

��

U

V -�

i- '1'

"-.4

I-.--

.4.- ' �-�

-4

H

�� �

-. �

'J� �-N.J�C -'�vi

�. C 4 -'-, 0 -�

"-.4 C)- r-

C-

I�'4

>4I-

C4 L.

1-.

>.- -�44 � -

I-. -'-4

,�J �C- -I

-4 .- 4-4 �-i

I. I I I I 0U.4 * '-4

C) C) C' C) C) C) C)L.

(�stoci�j) A�t'�OC4S1A C-

-' CC- 4{ .* -4 -4 -4

'F- C)

It: CONFIDENTIAL 7

CONFIDENTIALNWC TP 5095 C1

-ý 0 c o

2N 1.0 00-)o ~ -

00 c-' tI '? I P0: o-44

I-0

r- c- 3 c : :lo

t 1 2 (-1 ~ I I

4.

U o

0. 0- 00

* n or.0 or,? cr0

of crn''n C

*o MoC I I I

I-I

.47-

4,~~ -u w, '

8~~~- COFDETA

UNCLASSIFIED'WC TP 5095

11AV7591.'24E,-24C). the ERE-1359 is rpeettv ofada iphticepoxide and showed a ligher initial viscosity than did the ERL.*4106,ýThis was pr'bhahly due to *poor miscibility of this diepoxide in theR-45foronite 6 mixture because of its aromaýtic nucleus. Th iis p oinftt waschecked out by substituting the diglvcidvl ether of butanediol(RD-ý2) for FRL--4206 at two levels as a co Icuring agent with IPD)I. Thisepoxide (RD-2) in combination with HIMI unexpectedly shortened Potlifedrast ica-lly and increasted the brittleness of the cured propellant.Since the epo~xides have niot provided significant improvements inprocessing and me-chanical' properties, they have been dropped -fromfurther cons Ider~at ion in these propel lants.

(U), A ha-tch was processed to dleterminne whether Ior not replacement ofUronite 6 with ilID would give any viscosity benefits without adverselyaffecting mechanical properties. Al though the complete replacement ofOronite 6 by IDP resulted in imiproved processing, this was offset bya reduct ion in bothi vmechanical propertivs and burning rate of thecured propellant (Table 11l.fAK7591-1l, -13).

(U) Becaus-0 of tire lon g' interim mix cycle and the coarse aluminumused in these propel lants, it was desirable to know whethier or not thealum Iinuim was produicing any side effects as a resuilt of abrasion. Thedata (The2, "~AK759 1-26) indicate a slight lowering of the burningrat e and a somewhat harder cure than is normAlly seen. If th e dataare significant, then a possible explanation for the lower burning ratecould he less efficilent breakup of the U17AP particles and the hardercuri:e could be. attributed to less react ion of the fresh aluminumn surfacewi th the hydroxylI groups; thereby allowing more complete reaction withthe isocyanate curing agent.* The effect is smnall enough, thiough , tobe considered as :a normal variation for this propellant.

(U) 'rwo hatches were made in which the bal list ic solhids wore loweredby one and two percent, respectively (T[able 2, f#AK5691"42 and -28).

igificat improvement s in processing andl mechanical properties wereseen, especially for the 83", solids formulation. IhesciieIburning rate, however, was too great to give serious cons-iderationto this approach to improving process ing and mechanical properties,

(UT) Since all of the hydroxyl groups on the R-ý45M were not be ingusedI in the pol ymerizat ion due to the less than stoichiometric 'leve lof IPI)I the level of R-45M was reduced to the exact stoichiometrywith the IPIJI present, while the Orontite 6 was increased to make upthre di fference('rable 2, #A0:591-52) . It was hoped that the processingan(I potlife would be significantly improved withi the increased plasticizer:level without adversely affect ing other parameters. 'hie data indicatet~hat no slgi~ if ic.ant beniefits wore real ized , whiile the burniing rate andmechanical properties were adversely affected. No further efforts- inthi1s direction are planned.

UNCLASSIFIED9

UNCLASSIIE'DNWC Ti' 5095

0 C £2Co' .C oc C2

, k

(I)The observation that res IdualI R-45M onl thle outsidae of ti~c canevenituall1 form.ed a polymer led to thle spccul at ion that oxidativyeeroL)s s 11 n ng miay hb Iowl 15 uatzs i otg a v i scs it s Inc r ea1s e i n thIie R- 4 5M

ho jg uised. An I dent ical lot of this iR-45. was evaluated to sev ifany dI fferemnces in proce~ss lug i:ve r appairent (Table ,:AK5 =6Al though the da* a show no signlificanlt di ffe rences, -there wa;;s a not i cCable imnprovement inl tile processing, *indlicatinog, that the exposed can ofR-h SM had mide rgone a small amount of ox ida tivye cros slinking. Pfe ca tt i on sare be ing t aken to Mm ti-llI?.o sHch di ete iorat ions .

(1,) A s ign ific ant i mproVemenit i n po t I.i f was a ch i e ved b y %is ingR-!i5M mod( i f e d t o remove thI e i n.act L;ve Ih:.yý iro xy I g ro ups (Tab I e,~AK 7 5 9 L 2 -76) A graphic ill uLst r-t. ioll of the effect of modifiled h

CONFIDENTIALNWC TIP 50955

--. 'ofw- t f

000

10

-n >

-- 4 4 I

0 0r- in *-,;7 44 ~

c)e rC I~ In-- r

.0-. . . . . .

4-. -

*~~~ 4)__ _ _ _ _ I- 0-

1U 0a

=i CDo 0 ,tn U

C4 m

0 -0

tz cO f-c IA -c -0s 1 I ~n4 'I c-) n In c .0 U U

CONFIDENTIAL0NWC TP 5095

900 0 r2000 - 3.40 ips -..-.00:

90 - o40 UFAP (0.5,) / 029 UFAP (4.6,)

0.7580.

15 Al-

70 - 0.5/0.5 Sit0)/Fe20 /03Ji5 iR-!ITPB3

50 ,

40

S~/30 "

/ ///• " /0 ,/I

8/

10,000 dynes/cn- ShearStress

O 1 2 3 4 5

Hours After IPDI Addition

(:) FIG. 2. Viscosity Buildup at 120'F on Propellant "A" with (1) 0Regular R-45M (AK7591-70) and (2)U Modified R-45M (AK7591-76).

12 CONFIDENTIAL

UNCLASSIFIEDNWC TP 5095

p t

tz~

E4

Iý t. )0

0 0-

r, 3 -ý

tn

Ljj

* u~ > r13

UNCLASIFIE

UNCLASSIFIEDNWC TP 5095

catalyzedl with o)ne gram of conc. 11.1 S allI in 250 ml of toluene. Thle4solution was ref luxed for b hirs. in which time nine ml of water wasalcotroped off by the toluene signifying completion of the reaction.The toluene solution was washed twice w,-*th distilled water driedover anhydrous MgSi), and filtered to remove dryilng agent. Ihe toluenewas removed tun(er vac uum onl a rotary f ill, evaporator and the resultaintoil was distil led under Vacuumr to vield ~200 gnis of thlt des ired esterboilling at 107- 109':/ 3mm lHg. on lv half Of the oron ite 6) was rep lacedwith this m-ater'ial, but it made thle propel lant difficult to processresuilt ing in I br itt le proptl I aint wit 1ch coul d not ho tes ted for bulrniingrate. Since It appears that signi f icant amount-s Of fluorine cainnotbe incorporated int-' this propel Liant sys teri wi thout seve rely degradingproceoss ing and mechan ical properties, n o further effort In tiiisdirection is planned.

(v ieyground errcn-fradhdepol rvier wais evaluatedat the two percent level to see if, its beoliavi or Was like th'Iit Of thleliqulid ferroecene derivatives, 1.v., show a nearly linear Increase Inburning rate withi Inc reast. in fe rrOCe.ne con tent (labl 4, !i AK 7591-50).Not on ly did it not signifi cant ly increase burn ing rate, but itsever lv curtailed processabii v ts and promoted a y rvorapi, crA possible explanation for its poor behavior as a burning rate catalystis its high polymeric nature which roduces its abi 1 itv to interactwith the Nl lý 0, CIO con trary to the low molecular weight li quid( andsolid~ for rocene de r ivat ives, suich a's caitOCCne and1L n-bultV vi o rr-ccene

(U) Significant increases inl thle burnilng rate of p ropell1ant "'A"'however.* were- achieved (luring, thiis report period (lab le 3, 0,AK7591 ý93,-75). Thle first ballistic Improvement viol ded a buirning rate at'0001 ps Ia approximiately sevýýn p)ercen t hiighuer than the(. centrol1 bat chand was aCjli4i eyd by replancing the Pilgmert grade iron ox ide (C . K.Williams, Lot 4,Y'2196) with a red crvstal line ir-onl oxide (F. C.. DavisCompany) a sample of whiichi was provi[ded by thle Naval Weapons Cent er.,No other effects.* adverse or othe rwisoe, were observed wi thu thiis newiron oxide.* Therefore, all future propellant "A'' formulat ions airebeing planned vi th it . This inc rea,;v broughjt toi three the numiber ofindependeont IV acli it evod burnling rate inc reases to date . thet othle r two-being achieved by (1) roplac ing the 8 MIA Al' wi thu 1: FAI' and(2 ) inc roas i ng thI e loeng tIt of t l ie mi ix cyc 10e, the t rs tilts of ,Aihi ch werereported inl thle previous quarterlyv report. All three factors werecomb intd into one- propell Iant to y iedI ( a so 1 id st rand burn ing rate of3.62 in / sc at t1)1100 psi a whuiclh exceeded tile mi n imum prog ram goal forpropellant ''A". * An identical batch prepared to confirm tliis burn ingrate (Table 3. AK7591-19) * yielded a biuriv)io rate oif 3.4 inl/se-c. at21000 1) ha.ile re'ason for thle lower rate is iin-e rt ain * but may be aresult oif different test in, mctluiuls tioth . In the former bat ili,thle strands usedl were eXact lv 1' long and were f ired in a clIosedlbo0mb. 'File repeiateul hatch was test td withi st andard 5'' st rands.

*See Table I(AK7S'1)I -1

14 UNCLASSIFIED

CONFIDENTIAL

Nb•'+C TP 50O95

- C.--,-.-.-I.

-- - - "J - .'.

,- ,

-- • v • .C • -' -• -',

f -

3 -•- 3 -

r --

UNCLASSIFIEDNWC TP 5095

(U) It was of interest at this time to learn if the 3ame burning rateachieved with the 50/50 mixture of Silon S ana t!,e red crystallineiron oxide could be achieved or surpassed by ,!•ing this new ironoxide as tie :iole burning rate catalyst at the sat-e total percent.The rate achieved (Table 3, I0AK7591-.5A) did not equal the rate (Table3, I.-AK7365-93) achieved by the 50/50 combination of Silon S and thesame crystalline iron oxide. This result indicates that both catalystsare needed in comibination to achieve the optimum burning rate.

(c) A new lot of coated submicron UFAP was prepared and XSA analysisrevealed the average particle size to be 0.55;. Three batches wereprepared during this report period using this material (Table 1,;.AK759I-30, -32, -34). The burning rate data indicate that the new0.55.; FlAP achieves the burninhg rate of 3.5 in/sec at 2000 psia. Theinteresting fact, however, is the variation of this burning rate amongthe three batches. There seems to be a correlation of burning rateeither with urethane level, unreacted hydroxy level or propellanthardnesss . It is not known at this time which, if eitler, Is responsiblefor the variation in burning rate, since additional batches did notsubstantiate this trend.

(U) One other ballistic modificationl that vielded no increase inburning rate consisted in the replacement of the a!luminum with magaesiumand a 65/35 magnesium/aliminum alloy powder. A comparison of theburning rates (Table 3, .iAK7391-5H, -5C, -51)) of these withI a batchcontaining a conventional aluminum powder (Grade II) revealed that thechange from aluminum to magnesitjm hiad no effect one way or the otheron the burning rate. The failure, however, of magnesium to elevatethe burning rate was not too surprising, since burning rate increasesobserved with this metal powder were in propellants containing varyingamounts of fluorocarbons. The :a•agne siun powder aid not adverselyaffect processing or cure.

(tU) A small sample of crystalline Fe. (Lot 15) from NWC wasevaluated along with a 10 lb. let tof crysgal1ine Fe. 0.3 recentlypurchased from Frank C. Davis Ceompany. No differences In burning ratewere obhserved (Tabble 4, (:AK7591-48, -58). The batch containing the(lot 13) Fe 3. did process s,mewhat better, however. A s i gn if i cantIncrease in-burning rate (Table 4, vAK7591-60) was achieved, though,by grinding a portion of the crystallin 1 e Fe2O from the 10 lb. lot fortwo hours in Freon usin;; Al., 3 1/4 cylinders for grinding, and amechanical paint shaker ti i5rovide agitation. The resulting powder%qas obviously much finer than the unground material and was muchredder in appvarance. The ave rage particle size has not yet beendetermined. Th[e finer Fe. O 3l ,4so, apipeared to function as a bettercure catalyst since the dhta show a shorter potlife for this batch.

(1) Since the ground Fe 0) gave a faster burning rate, it became desir-able to determine if the c .aacentration of 0.55, I'"FAI may be reduced andstill meet the 3.5 in/sec. burning rate goal at 2000 psta. The data

16 UNCLASSIFIED

CONFIDENTIAL%,wc rP 5095

1(Table 4, #~A9759l-68, -170) indicate that a drop of 5 wt. % in this fineoxidizer very nearly m~eets the desired burning rate. Also, the process-ability improvcsý very rapidly as tile level of 0.55,1 UFAP is lowered.Thle binder wa;s altered for thes-e batches to provide t softer propellant,wfiich explains the lower tensile strength and higher elongation values.

PROPELLA%*T "B" BALILISTIC STUDY

(u) Ut~tilIzing the information gained in developing propellant "A"~,a batch of pfopellant " 11, wa s prepared (Table 5,, !IAK759.1-54) thatex Ice eded the 7.0 In/sec. burning rate goal at 2000 psia using fourpercent catocene rather than tile five percent ffycat 6 that was requifred-to rea,1h the same rate. on the previous program. Additionally, bettermechanical propr~eties w'ýre real ized than before, but 'the Shore "A"hardness was too hi1gh and the potlife was not as long as desired. Itis expected that tile potlife will be significantly extended by the useof modified R-5''

:(U) Having achieved the desired burning rate with four percent.catocene, it bec'ame of interest to see hlow ihighl a buirning rate couldbe adhieVed at three percent catocene level. Three batches werepreparedi (Table 5, !,.AK759l-66, -72, -74) 'In which the 0.55,i~ UFAP wasvaried from 507ý to 407 in com~bination w`th MA%-AP and 5,,: UFAP. Tile

* (lta sýhow that tile catalyst level is significantly more effective inraising tile buirning rate than increasing the fine oxidizer content.The final choice for balli1st ic properties appears to be between

* 3.5 -47ý caitocene and 40 - 4570.5,1 LFAP. The choice will be madebased on ove rall properties withlin 30 days.

PR0PEI.LAN'T "B3" HAZ?.RD T!FSTS

(U) Safety d1ata acquired on the formulation containing four percentcatocene Indicate this propellant is type 51) due to high frictionsensitivity.' However, at three percent catocene tile frictionsens itilvi ty wzas quite low 1,d icatbing a less hazardious propellant.Unfortuinately, the trrore, sensitive propel lant also had a high shcrehardness wh ile tile less sens itivye one had a low hardness re~ad ing,and] since friction sensitivity tends to go uip with propel lant hardnessit is not 'known whether high Ceatocene , highl shlore hardness or bothare responsible for the increased f .riction sensitivity. Thils poin~tis current ly be ing investigated.

CONFIDENTIAL 1

CONFIDENTIAL

I.. 0.,il Ua

0

00

1 00<

0~.0-

-r F= . ri*

X- o CD o0 0 l

ZDi 0 E0

Co

0r'.~ ~ 1- 1.. r_ 0-*~~'0 c ~3

r 41 4. a0 0.M '

-4 .-

" 0W M C'1- >

-4 -4 - 0 40. 0.~ L6 j ý

0 0 0 0 0 C0Am).- 0 0 0 0 0 * )(

H~~~' C-. Afi w' C' 0 ' -7 '' 0.C

IJ W 07 0 4u Q4 1-4 *C

Ln 0-cf C04 8. 0 0 0 0 q)* W 0 0 CD

-44

- -l . -o

.41 0 o4.o. o o-

I~~ u~ 'TJ 4.1 4.

18 CONFIDENTIAL

CONFIDENTIALN•C TP 5095

.. f-.' •

S.. .. ..

: j* 7. ' - ,. - • • "-.

• , : ,,

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r. ..7. " '

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CONFIDENTIAL%WC~ TP 50195

HIAZARD)S TEST D)ATA

Batch No. AK7) 91 -54 AK 7/91-74

50' Fire Point 11 ni:/2 kym --

O~nse t of l?.:xtheritr 38Illxot heiLrr! i c Pt, l.: '3ýi) F

AnIIt o 1 W; it i on !, o :1-

LINEKR AGINit; STUD.Y

(W) In!te pr'.'ic-l'- re-port pt-riod .-overal Iliners were evalunitedw.'itl a lI(- :) 8f) SoIi ds. sca le- un bith 01i of prpe I nt. 'A". A I fititrforinilat ion dl..:gnatevd 43'.-4. 0 x v iblted good hud ito; to this formijiat.ion

whoe, tested ill ai D1`l specimen. 11b lsIiner twas prepared by procuring, itfor four hour,; at 1 3')'1 prior to cast I u; ill tot pr''Pt linlt. ITIb isres~il te inl a tHi' specimen t hat. -%hlihiit'd cohetsive faii nrc inl thepropel IIant . On thet other hjiul th~is -mw 1 iuer when fuilly cured priorto prop1 Ii;ait cast ing retiultc fel nit iiiidhe-sivc tlu lure. HI' effecIt Otstorage att 1 310' ont the bond stnrigit h s detc~rio inet-. I he resnIitsas ; 1 ,own be vo I( uild CI ct 0 thI a t Cic I lkrl/p ropej I I lilt bon~ld rt,:7!;i i TuCtOxCel I !"tt a ft c r ugin,

Alli FN I ;;!oNFH iio AT I V)"V

P'rope I I ant "A"'

434-L Inlitifal q s ColIt I V eV in1 P~rObV I I ant4 3 4-4 1 Itouth 121. 5 Cohený i ve i n prope 1 I flnt

20 CONFIDENTIAL

UJNCLASSIFIEDNWC TP 5095

This liner appc~ars to be satisfactory, and tile plans are to use it asthe liner for thle propellant grains that are to be prepared anddelivered to Naval Weapons Center as per contractual requirements.

WORK PlANNED FOR NEXT REPORT PERIOD

(U) [he final select ion of the two final candidate propel lants, :"A"and%" wU e ade at thle beginning of thle next repott period.

Processing, meclianicdl and b~allistic properties characteri;?atitons ofthe two prope'llan~ts will be miade as well as lhazard classi ficattiol forboth the uri'lired anid cured states. Preliminary aging studies will bein itfated conicurrent ly %:ith the preparat ion and delivery of tell 1.8 in.ýby 6.25 in. long grains of each of the two candidates. Also, theIpreparation of four 5 In. 0.1). by 15 in. long grains of eachfornmulit ion will he Iintiated,

UNCLASSIFIED 2

UNCLAS%`IFIEDNWC TP 5095

Glossary of Terms and Abbreviations

Agerite White An~tiox idant

A9 - 2 246 Ant loxi dant

All Ammonhium Pe~rchioratc

Aerojet propriv~tary goathing agent

BRA-99 At, ro jet proprietat'.' combutiot~n catalyst

BRA-l01 Ae roj et proprietary combui-.tlon catalyst

C-1.1BC a r 1) o teriminated pa I vhitad jene

1) 1ifvyro:xv functional wet ting agent

1:DB ,wro jot prop rie ta ry fuel cimpaneuT~

1: R1. -4 205 1½ i (2 -3- p oxY 1) laet.vlIt )tlI IUr

I:R.-2213,-lpxvvclklie.:.:v met fylI - ( 3,4-vpoa.:V) (cýc lali.xanek-a rbaxy Iate

Kt- 1 ~5 At- rjet prapr i tar\' fue I cornponentFreoan- 1 13 1,1,2 1rifluoro-1 ,2j2 lrifliuora-l 2,2 rhlrtae

HIC-4 114 (:krbo>:v-tcriuinatt-d poly\bit ad i gnu (liii aikol C hemical (Ca.

11111Il.' xame-t liv I vne ( I i J.iocvaluat t,

iITPB ~Ilyd roxv te rm inated pal vbuitad iet-l1ivgat-6 A non-volatilt., H iptid ferroceneL d'riVa3tiVLy

[DPi - Iecy pe largonate pla;t ic I ;cr

HIM!) Isophiarane diii 5i.' j1nkt('

Isonol Phoisphoarous conta in ing palyoi

MA Mi kro -at omi 7 .r g roound at-nn I inn po-rub I i trIa t t,

NSA M!int- Safet% App! hinces Co, , parT i Ci 10 iýL vwaairnapparat us, I I I (lli Id SOeIiMl Imetit i On t.cn V CI IT III

n 11, n - B IItvI fevr ro ccn e

* P- 33 Thermal carbon blaCk

PAP Porous Ammon ium Perchltorate

Plast inox 711 Ant ioxidant

* R-45M Free radical in it iated F1ITP

iRefrasil Silica Fiber

SS-AP SI ow-spc ?d m ik ro- pu1 -:.-r i ed ground armman i operch lorate

22 UNCLASSIFIED

UNCLASSIFIEDXWJC T P 5095

Glossary of Teris and Abbreviations (cont'd)

SURFAC OS Carbox

-~~~1 C C.- C C

id 6

!* *0 ci m

Aa~. C*,

5 - A C:

4e ~ --

- - * ICAI .2l

.- ,

U r-

z 1-~ C: aIi , I. f0~~~~ 0 . 4 ~- **

I) c Ij 0-hIA j

44&j 0 w

-~ ~ .. I ttAu- F 0 t

441

C-- 7

P!~ 74

* -. ~ .-. moC

-4CZ = c -.- --

.- -4

- - --4 L- ý:.

'4 41

CD m~ -40 4 mm C, "

C4 nu u m ul u 'n 1

F- ~ H

~ Goel C7 ~ .- w. C6

1 4 U 'T

I-40

- C- rl

0 M

N S t. N? Ct ri 0

V) u-~

V3 0

rd . $

'~ CL

C0' ;1'C:

- -

41

-4 -. tl-~ -11

MI~ -, - *-:4 H -i' 7

-4 1.,' w0.*4-.0 1 ~-4 *J0

: .4 Aw-NAJ. ~~~Aw

- ýd ) .

4j >. -!Cr

0 V --,4'

w r_ D k .. W C x-

Q) L -4

C.' j -C-u)cl L .0~. 0. U

Ch~ U

0 .0 -4 . -4,4 W~~'.i.U UP

Q~ N -l m- 11 14 ..

W 0f~ P - .0 &j f U -- aP

c~~~~~ o ; * C 4

c.Goý'* ~ C ~ 5

00CUmEiNT CONTROL DATA -R &0

Aerojet General Corporation CONFI DENTIAL

Sacramento, California 4 ..

-FAST-3 ,WRNING RATEI'[IIG1 51LOpE yROPEI.LXNT'T COIOLOGY PROGRAM I.

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/) NO123-7(J-C-l457,' 'I /A3)4l001161/tl ---. %WCýTP 5095

In addition to secuirity requIirements wh i ~li apply to this document andi must be met,cach transmittal oiltside the Department f Defense must have prior approval of theNaval Wea Lons Ckcnt. _ __-

Naval Weapons Center

China Lake. California 93555

01) This is the second quarterlw pjigress report on work conducted to advance

state-of-the-art with regard to formulation of practical fast-burning and high

pressutre-exponent propellants,. Primary emphasis was directed toward optimio.atienof the processing, mechanical, and haIli~tic properties.

NŽn Approaches to improving propellant processahility included variation ofamount and typt. of plastiei t, use of blocked or hindered isocyanate curing agentsevaluation of epoxide cur'- , agents; and rhodi ficat ion of R-451- prepolymer. The lastapproach was found to be by far the most leffective, andi satisfactory provessab ilitycan be achieved with propellants meetingithe desired ballistic and 'mechanicalproperties.

DD .. OR. 1 4 7 3 4UNCLASSIFIED

A, SV ! X T gy LIJ

.4 tP,11-N, ft .N* C

kO -L -0 L

SoI d ProPellant

Ultrafine APPorous ApHigh flurn~ing RateHigh SlopeEe trocene

DD %ovo1473(PACF 2) *iF~

", REPORT HAS We:EN DELIMITED

, CLEARED FOR PUBLIC RgLIAIE

P0FR DOD DIRECTiVE 5200,20 ANID

"RESTR1CTIONS ARE IMPOSED UP ON

V; USE AND DISCLOSURE,

, I'-,lI JBUIION STATEMENT A

fA PPROVED FOR PUBLIC IELAASEj

'•STRIBUTION UNLIMITED,.

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4~:. AUTH OMIY.

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