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The Influence of POSS on Photopolymerization Shrinkage , Photoreaction Behaviour of Polymer Kinetics and Photo-rheology Dispersed Liquid Crystals  
The Influence of POSS on Photopolymerization Shrinkage , Photoreaction Behaviour of Polymer Kinetics and Photo-rheology Dispersed Liquid Crystals
资料类型: PDF文件
关键词: Polymer  dispersed  liquid  crystals  Polyhedral  oligomeric  silsesquioxane  
Volume  shrinkage  Photopolymerization  Photo-rheology  
资料大小: 108K
所属学科: 分子表征
来源: 第六届亚欧研讨会上处理和性能增强聚合物会议文集(2013.6.2-6 武汉)
简介:
Polymerdispersedliquidcrystals(PDLCs)havebeeninvestigatedintensivelybecauseoftheirinterestingpropertiesandpotentialapplicationsindisplayandelectro-opticaldevicescl].WhenpreparedPDLCsbyphotopolymerizationinducedphaseseparation(PIPS),thedecreaseinaveragedistancebetweenmonomersduringphotopolymerizationcausestheshrinkage.Theshrinkageinducedbyphotopolymerizationinfluencestheelectro-opticaI(E-O)propertiesofPDLCssignificantlyc2],andthusitisimportanttomeasureandcontroltheshrinkageaccurately.Inthiswork,polymerdispersedliquidcrystals(PDLCs)with0一10wt%methacrylisobutylpolyhedraloligomericsilsesquioxane(MI-POSS)werepreparedbyphotopolymerizationinducedphaseseparation.Photo-rheologytechniquewasusedtoinvestigatetheeffectofMI-POSSonthevolumeshrinkageofacrylate/liquidcrystalscomposites.TheeffectofMI-POSScontentonthephotoreactionkineticswascharacterizedbyPhoto-differentialscanningcalorimetry(P-DSC).Theseresultsshowedthatphoto-rheologytechniquewascapableofmeasuringphotopolymerizationvolumeshrinkageaccuratelyandeasilyonline,andtheresultsobtainedfromthismethodwerealmostsimilartotheseacquiredfromthedensitymethod,whilepossessingsmallersystematicerrors.MI-POSSreducedthephotopolymerizationvolumeshrinkagefor29%,howevertheconversionofdoublebondwasnotchangedwhenitscontentincreasedfromoto10wt%.
作者: M. L. Ni , H. Y. Peng , X. P. Zhou, Z. G. Xue, X. L. Xie
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