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Molecular Dynamics Simulation of Interfacial Dynamics and Micro-structural Evolution under Tension of Polymer Nanocomposites  
Molecular Dynamics Simulation of Interfacial Dynamics and Micro-structural Evolution under Tension of Polymer Nanocomposites
资料类型: PDF文件
关键词: non-equilibrium  molecular  dynamics  payne  effect  "  polymer  
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资料大小: 104K
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:
Bybuildingapolymernanocomposite(PNC)system,adetailedcoarse-grainedmoleculardynamicssimulationisadoptedtoinvestigatethechangetrendofthemodulusandthemicro-structuralevolutionunderuniaxialtension.ThemechanicalbehaviorsofthePNCsystemarestudiedundernon-equilibriummoleculardynamics.Wecalculatethestress-strainrelation,andbyfittingthecurveweobtainthemodulus-strainrelation.Thephenomenonofthemodulus,drasticdecreaseduringl%-100%strain(similartoso-called"Payneeffect")isobserved.Wehavealsoemployedthevisualizationsnapshots,thenumberofneighboredfillers,thetotalinteractionenergybetweenfillersandpolymerchains,bridgingchainsinthesystemtoinvestigatewhatmicrostructureevolutioncausesthedramaticchangeinthemodulus.Oursimulatedresultsgenerallyindicatethatthebreakupofoverlapped"polymershell"aroundnanofillersisthemaincauseofPayneeffectifnanofillersaredisperseduniformly,whilethebreakupoffillernetworkisthemaincauseifnanofillersarespatialaggregations.Wealsofindthatwhenstrainislargerthan100%,themodulusofthePNCsystemdecaystoalittlevalueandhardlychanges,andourresultsindicatethatthemajormodulusisprovidedbythepolymer-mediatedfillernetwork.Ingeneral,ourcomprehensivesimulationresultsarebelievedtoprovideapreciseanddeepinsightintothemechanicalbehaviorsofPNCmaterials.
作者: J. X. Shen,Y. Y. Gao, L. Q. Zhang
上传时间: 2013-07-03 15:30:09
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