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Thermal Stability and Morphology Studies on Polyhedral Oligomeric Silsesquioxane/Polysiloxane Composites Prepared by in-situ Reaction  
Thermal Stability and Morphology Studies on Polyhedral Oligomeric Silsesquioxane/Polysiloxane Composites Prepared by in-situ Reaction
资料类型: PDF文件
关键词: poss  polysiloxane  in-situ  reaction  dispersion  thermal  stability  
资料大小: 110K
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:
Thisworkfocusedonthepreparationofpolyhedraloligomericsilsesquioxane(POSS)/polysiloxanebyin-situreactionandaimedtoimprovethedispersionofPOSSandthethermalstabilityofpolysiloxanethroughtheformationofchemicallinksbetweenPOSSandpolysiloxane.TwodifferentPOSS,octaisobutyl-POSS(OIBS)andallylisobutyl-POSS(AIBS),wereincorporatedintopoly(methylvinylsiloxane)(VMQ)bymeltmixingandthereactionofPOSSduringtheperoxidecuringwasstudied.NMRanalysisrevealedthatAIBSmoleculescontainingdoublebondsweresuccessfullygraftedontoVMQmacromolecularchainsduringthecrosslinkingofVMQ.MoleculardynamicssimulationandthermogravimetricanalysisshowedthatOIBSandAIBShadsimilarparametersandthermalstability.However,morphologyandthermalstabilitystudiesbymeansofopticalmicroscopy,X-raydiffraction,scanningelectronmicroscopyandthermogravimetricanalysisdiscoveredthatAIBSexhibitednano-dispersioninVMQmatrixandimprovedthethermalstabilityofVMQ,butinertOIBSmoleculesaggregatedextensivelytoformcrystalsandadverselyaffectedthethermalstability.FurtherstudiesonthethermalstabilityofVMQwithdifferentcontentsofAIBSshowedthatthethermalstabilityfirstincreasedwithincreasingcontentofAIBSbutthenbegantodecreaseasthecontentofAIBSexceeded7.5wt%.ItrevealedthatthegraftedPOSShinderedthethermaldegradationofpolysiloxanebuttheungraftedPOSSfavoredthethermaldegradation.
作者: Meng, Z. Wei , L. Q. Zhang
上传时间: 2013-07-04 13:21:18
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