Comprehensive Characterization of Natural Rubber Samples using … Event/201… · Thermal...
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Comprehensive Characterization of
Natural Rubber Samples using
Thermal Field-Flow-Fractionation
coupled with MALS and Triple Detection
Dr. Gerhard Heinzmann, Postnova Analytics GmbH, Germany
International Symposium on GPC/SEC and Related Techniques,
Amsterdam, The Netherlands, September 26th-29th, 2016
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• FFF Separation Platform
• Thermal FFF (TF3)
• TF3-MALS and TF3-Triple/Tetra/Penta Detection
• Application Examples
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Separation and Detection Platform
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TF2000 Thermal FFF
AF2000 Flow FFF
Light Scattering
Detector
PN3621 MALS
RI detector PN3150
Concentration
Malvern
Zetasizer
Agilent 7900 ICP-MS
CF2000 Centri FFF
Size Separation
UV detector PN3211
DAD detector PN3241
Fluori detector PN3411
ELS detector PN3510
…
SC2000 GPC
Viscometer detector
PN3310
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FFF Separation Principle
Separation Mechanism
• Separation in a narrow ribbon-like channel
• Laminar flow inside the channel
• External field perpendicular to the solvent flow
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Thermal FFF – Principle
TF2000: Separation
VE ~ DTΔT/D
Thermal Diffusion
Coeffcient
-> Depends on
chemical composition Applications
• Rubbers Polymers
• Gels / Latexes
• Cross-linked
Polymers
• Thermal gradient up to Δ120°C
• Separation kDa up to several MDa
• Analysis time, 10 – 120min (no upper limit)
• Separation depends on Size and Chemical Composition (“2 Dimensional”?)
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Advantages of Thermal FFF
compared to GPC/SEC:
Excellent separation for
high MW extended
´Exclusion Limit´
No filtration of gel
material, no clogging of
columns No shear degradation in
porous columns / frits
No interaction
with stationary
phase
Thermal FFF vs. GPC/SEC
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FFF – Triple Detection
- MALS
- Viscometer
- Concentration Detector(s)
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Thermal FFF
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Setup of TF2000 Thermal FFF with Triple Detection (Penta Detection)
MALS / Viscometer / 3x Concentration Detector
Detector Setup: UV => MALS => Visc => RI => ELSD
Conditions: Solvent = THF, Flow rate = 0.3 mL/min
Alternative Setup: UV => MALS => Split: Visc => Waste and RI => ELSD => Waste
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RI signal = KRI * (dn/dc) * Conc
LS signal = KLS * (dn/dc)2 * Conc * Mw
• MW from MALS + RI
• Rg from MALS
• IV from Viscometer + RI
• Rh from Viscometer + RI + MALS
• Mark-Houwink plot (log IV vs. log Mw) shows structure and degree of branching
Determination of Mw, Rg, IV and Structure
Visco signal = KVisco * [ƞ] * Conc
UV signal = KUV * Ɛ * Conc
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Results
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TFFF Applications – PS
System • TF2000 FFF System
• PN3150 RI Detector
Conditions • Injection Volume: 20 µL
• Concentration: 2 mg/mL
• Temp. grad. T = 90°K to 0°K
Separation of PS standards
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TFFF Applications – PS with Pentadetection
System • TF2000 FFF System
• PN3621 MALS
• PN3310 Viscometer
• PN3211 UV
• PN3150 RI
• PN3510 ELSD
Conditions • Injection Volume: 50 µL
• Concentration: 5 mg/mL
• Temp. grad. T = 90°K to 0°K
DOW PS 1683 / MW = 250 kDa, PD = 2.5
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TFFF Applications – PS with Pentadetection
System
• TF2000 FFF System
• PN3621 MALS
• PN3310 Viscometer
• PN3211 UV
• PN3150 RI
• PN3510 ELSD
Conditions
• Injection Volume: 50 µL
• Concentration: 5 mg/mL
• Temp. grad. T = 90°K to 0°K
DOW PS 1683 / MW = 250 kDa, PD = 2.5
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TFFF - Separation by Chemical Composition
Separation of PS and PMMA-Standards with same Rh
SEC vs. Thermal FFF (TF3)
TF3 enables separation of molecules with the same hydrodynamic
volume according to their chemical composition!
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TFFF Applications – SBR Rubber with Pentadetection
RI
ELSD
MALS
Viscometer
UV
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Application Example:
Natural Rubber
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Radius of Gyration Molar Mass
• Nanoscale impurities with same size separated according to different
chemical composition
TFFF Applications - Natural Rubber
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TFFF Applications – Natural Rubber with Pentadetection
System • TF2000 FFF System
• PN3621 MALS
• PN3310 Viscometer
• PN3211 UV
• PN3150 RI
• PN3510 ELSD
Conditions • Injection Volume: 50 µL
• Concentration: 5 mg/mL
• Temp. grad. T = 90°K to 0°K
Natural Rubber Sample (Polyisoprene)
a = 0.98
Stiff chain structure in low MW area
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System • TF2000 FFF System
• PN3621 MALS
• PN3310 Viscometer
• PN3211 UV
• PN3150 RI
• PN3510 ELSD
Conditions • Injection Volume: 50 µL
• Concentration: 5 mg/mL
• Temp. grad. T = 90°K to 0°K
Natural Rubber Sample
a = 0.49
More compact structure in high MW area (branching?)
a = 0.98
TFFF Applications – Natural Rubber with Pentadetection
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0.025
0.125
0.225
0.202
0.206
0.21
0 10 20 30 40 50 60 70
ELS
D D
ete
cto
r Sig
nal [V
]
LS
Dete
cto
r S
ignal [V
]
Time [min]
__ LS 92° __ ELSD
Raw Data Fractogram of TF3 - MALS and ELSD
System • PN5300 Auto Injector
• TF2000 Thermal FFF
• ELSD
• PN3621 MALS (92° SLS)
Conditions • Injection Volume: 100 µL
• Concentration: 2.0 mg/mL
• LS 92°(red trace)
• ELSD (blue trace)
• The fractogram shows a system start peak at 11 min.
• The 1st peak – the main peak - was detected between 15
- 50 min by light scattering and ELSD detection.
• A 2nd peak was detected at 54 min predominantly by light
scattering.
TFFF Applications - Natural Rubber
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0.000
0.002
0.004
0.006
0.008
1.E+04
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
1.E+10
1.E+11
1.E+12
11 21 31 41 51
Dete
cto
r Sig
nal [V
]
Mola
r M
ass [g/m
oL]
Time [min]
Molar Mass / LS 92°
Overlay: Molar Mass and LS Signal • The molar mass was calculated from MALS and ELSD data • Literature value for dn/dc = 0.124 mL/g • In the 1st peak the sample contains rubber material with a molar mass of appr. 4.7 x 105 g/mol (w-
average) and in the 2nd peak of 3.6 x 108 g/mol.
Conditions • Molar Mass (red dots)
• LS Signal (blue trace)
• Fitting by Random Coil Model
Mw[g/mol]
1. Peak
13.0 – 48.5
min
n-Average 2.7 x 105
w-Average 4.7 x 105
z-Average 8.1 x 105
2. Peak
48.5 – 56.0
min
n-Average 8.1 x 106
w-Average 3.6 x 108
z-Average 1.5 x 109
1 2
TFFF Applications - Natural Rubber
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0.000
0.002
0.004
0.006
0.008
10
100
1,000
11 21 31 41 51
Dete
cto
r Sig
nal [V
]
Radiu
s [nm
]
Time [min]
Radius / LS 92°
Overlay: Radius of Gyration and LS Signal • The Radius of Gyration was calculated from MALS angular data
• The main/1st peak shows a Radius of Gyration of 42 nm (z-average) and the 2nd peak a Radius of
Gyration of 218 nm.
Conditions • Radius of Gyration (red dots)
• LS Signal (blue trace)
• Fitting by Random Coil Model
Rg [nm]
1. Peak
13.0 – 48.5
min
n-Average 23
w-Average 31
z-Average 42
2. Peak
48.5 – 56.0
min
n-Average 65
w-Average 107
z-Average 218
1 2
TFFF Applications - Natural Rubber
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Molar Mass
Molar Mass [g/mol]
1e+4 1e+5 1e+6 1e+7 1e+8 1e+9 1e+10
Diffe
rential
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.0
Cum
ula
tive
1.0
0.0
Molar Mass
Molar Mass [g/mol]
1e+4 1e+5 1e+6 1e+7 1e+8 1e+9 1e+10
Diffe
ren
tial
1.0
0.0C
um
ula
tive
1.0
0.0
Molar Mass Distribution
Zoom in Molar Mass Distribution
Differential Molar Mass Distribution (blue trace), Cumulative Molar Mass Distribution (red trace)
The sample shows a multimodal distribution. For the 1st fraction (13 – 48.5 min) the
distribution is in the range of 9.2 x 104 – 2.8 x 106 g/mol and for the 2nd fraction (48.5 – 56
min) in the range of 2.7 x 106 – 2.3 x 109 g/mol). The sample contains 1.3 % of high
molar mass material (gel). Calculation based on concentration detector signal.
TFFF Applications - Natural Rubber
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System • PN5300 Auto Injector
• AF2000 FFF System
• PN3621 MALS Detector
• PN3150 RI Detector
• PN3510 ELSD
Conditions • Injection Volume: 20 µL
• Concentration: 2 mg/mL
Fractal Dimension
log r
2
log
M
1.0E+01
9.0E+00
8.0E+00
7.0E+00
6.0E+00
5.0E+00
4.0E+00
TFFF Applications - Natural Rubber
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Fractal Dimension 51.6 – 54.8 min
The Fractal Dimension was evaluated for 2 different regions.
For the 1st region of the fractogram (17.5 – 44.6 min) the Fractal Dimension is 1.78 and
for the 2nd region (51.6 – 54.8 min) 2.92.
The Fractal Dimension change indicates that in the 2nd part of the fractogram there is
material with a higher density, indicating cross linking or branches.
Fractal Dimension 17.5 - 44.6 min
Fractal Dimension=1.78
log r
1.81.751.71.651.61.551.51.451.41.351.31.251.2
log M
7.0E+00
6.0E+00
5.0E+00
Fractal Dimension=2.92
log r
2.42.352.32.252.22.152.12.0521.95
log M
1.0E+01
9.0E+00
8.0E+00
TFFF Applications - Natural Rubber
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Summary
Thermal FFF is a Powerful Method for
Polymer and Biopolymer Characterization
• Increased resolution for high molar mass species • Huge flexibility in choice of fractionation power (gradient)
• No interaction with stationary phase / no artifacts
• No degradation due to shear stress during the separation
• No filtration by stationary phase or frits
• Separation according to molecular weight and size as well as according to
chemical composition offers new horizons for further applications
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Thank you for your
Attention
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