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Polymer-nanosheet Interfacial Behavior Revisited A Molecular Dynamics Study  
Polymer-nanosheet Interfacial Behavior Revisited A Molecular Dynamics Study
资料类型: PDF文件
关键词: nanosheet  glassy  polymer  layer  lnterfacial  behavior  
资料大小: 100K
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:
Inthisstudy,wewilltendtosolvetheintriguingissueaboutwhetherthe"glassypolymerlayers"orcompletelyimmobilizedpolymerchainsexistaroundthefillerwhichisstillunsolved.AndnoconsistentconclusionhasbeenreachedabouttheinterfacialbehaviorofPNCs,whichimpelsustostudythepolymer-nanosheetsystems.Weuseabead-springmodelderivedfromtheonesuggestedbyKremerandGrest.Wefoundtheexistenceoftheoscillationinbead-densityprofilesnearthenanosheetsurface.Theinterfacialpolymerchainsareorientatinglyparalleltothesurface.Polymerchainsareelongatedandflattenedalongtheirellipsoidsclosetothesurface.Theglass-transitiontemperaturedecreasesforpurelyrepulsiveinteractionandincreasesforattractiveinteraction.Forthedynamicanalysisincludingspatialdistributionofthepopulationofbeads,interfacialbeadsexchangerate,desorptiondynamics,translationalandorientationmobility,thegradientofpolymerbeadsisexploredandthe"glassypolymerlayer"existsforstronglyattractiveinterfacialinteraction.Thethicknessoftheinterfaceisestimatedtobearound5a.Theformationof"glassybeadslayer"occurssuddenlywhenthepolymer-nanosheetinterfacialstrengthchangesfrom2.Oet05.Oe.Aqualitativemodelisproposedforthreedifferentinterfacialsystems.
作者: Y. Y. Gao, L. Q.Zhang , D. P. Cao
上传时间: 2013-07-03 15:34:11
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