EffectsofPhotopolymerizablePrepolymerArchitectureonThermomechanicalProperties
ByJonScholteandAllanGuymonChemicalandBiochemicalEngineering
UniversityofIowa
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• LineargradientshavebeenshowntoinfluencetheresoluBonandsizeofpolymerblendmorphology.
Guoetal.J.Poly.Sci.B.2015,53,860-868 2
• LineargradientshavebeenshowntoinfluencetheresoluBonandsizeofpolymerblendmorphology.
Guoetal.J.Poly.Sci.B.2015,53,860-868 3
• BothNitroxideandRAFTmethodsallowforthesynthesisofrandomlyreacBveprepolymersfromasimpleonepotmethod
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EndfuncBonalformulaBonsshowlargeglasstransiBonforbutylacrylatebackboneandsecondforhddadomain
0.5%wtDMPA10mW/cm26min
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ConBnuousharddomainsinendfunc4onalmaterialsincreasesresistancetosuddenstress
0.5%wtDMPA10mW/cm26min
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1MPa
• RearrangementaroundTrithiocarbonatebondwillallowforbothrelaxaBonandagreaterdistribuBonofso^segmentsthroughoutthenetwork
• Ifrearrangementsareoccurring,theywouldcompetewithpropagaBonandthusalterreacBonkineBcs
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RearrangementaroundRAFTgroupdiminishesphaseseparaBonandleadstogradualdecreasesinstoragemoduli
0.5%wtDMPA10mW/cm215min
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Greatercon4nuityofharddomainsfurtherincreasesresistancetosuddenstress
0.5%wtDMPA10mW/cm215min
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1MPa
0.5%wtDMPA10mW/cm26min
Transferinrandomsystemsproducesextremelyrobustfilmsallowingforfurthertuningofthesystems.
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• NitroxideandRAFTprocessescanbeusedtomakefuncBonalPrepolymers.
• Architectureofprepolymermoleculesdirectlyeffectsmorphology
• RAFTprocessesallowssmallerso^domainsandnetworkrelaxaBonproducingtoughermorerobustfilms
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