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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
資料類型: PDF文件
關鍵詞: poss  polysiloxane  in-situ  reaction  dispersion  thermal  stability  
資料大?。?/td> 110K
所屬學科: 分子表征
來源: 第六屆亞歐研討會上處理和性能增強聚合物會議文集(2013.6.2-6 武漢)
簡介:
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
上傳時間: 2013-07-04 13:21:18
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