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Processing and Properties of Crosslinked Graphene Oxide/Poly( vinyl alcohol) Nanocomposites  
Processing and Properties of Crosslinked Graphene Oxide/Poly( vinyl alcohol) Nanocomposites
资料类型: PDF文件
关键词: Graphene  oxide  Poly(vinyl  alcohol)  Cross-Iinking  Structure  Properties  
资料大小: 78K
所属学科: 通用高分子材料
来源: 来源网络
简介:
Well-dispersedgrapheneoxide/crosslinkedpoly(vinylalcohol)(GO/cPVA)andreducedgrapheneoxide/crosslinkedpoly(vinylalcohol)(rGO/cPVA)hybridmaterialswerepreparedbysolutionblendingandcrosslinkingmethods.BoricacidwasusedasthecrosslinkingagenttointroducechemicalbondbetweengrapheneandPVA.InfraredattenuatedtotalreflectionandRamanscatteringtechniqueswereusedtostudytheinteractionswithintheGO/cPVAhybridmaterials.ThedispersionandaggregationstatesofGOandrGOinPVAwerecharacterizedbySEM.TheresultsshowthatGOcanformhydrogenbondorchemicalcrosslinkingwithPVA,whichresultsinamolecular-leveldispersionstateinthePVAmatrix,whilerGOandPVAforminter-layerstackedstructureduetotheweakinteractionbetweenthem.However,bothmentionedstructureshaveremarkablereinforcementeffectonPVAafterPVAmatrixiscrosslinked.Withtheaddingof0.8wt%contentofGO,elasticmodulusandultimatestrengthofcrosslinkedPVAgelareincreasedupt01500%and270%respectively,while1370%and239%areobtainedforrGOhybridmaterials.ThecrosslinkingbetweenGOandPVAsignificantlyimprovesthethermalstability,whilelayerstackedstructureofrGOwithPVAimprovestheglasstransitionpointofthePVAmatrixbecauseofthemovementrestrictionofPVAchains.ThestudiesonGO/cPVApresentfurtherevidencethatdispersionofnanoparticlesandinterfacestructurebetweennanoparitlcesandmatrixareresponsibleforthenatureofthehybridmaterials.
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