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The Location, Migration and Self-assembly of Carbonaceous Nanoparticles in Polymer Blends and Their Electrical Properties  
The Location, Migration and Self-assembly of Carbonaceous Nanoparticles in Polymer Blends and Their Electrical Properties
資料類型: PDF文件
關鍵詞: Location  Migration  and  self-assembly  of  carbon  nanoparticles  
Polymer  blends  Electrical  properties  
資料大小: 163K
所屬學科: 通用高分子材料
來源: 來源網絡
簡介:
Greatattentionswerepaidtolarge-scalepreparationofconductivecarbonaceousnanoparticles/polymernanocomposites(CNPN)withlowelecticalperlocationthresholdviathecommonusedmachiningprocess.Itisknownthattheelectricalpercolationthresholdnotonlydependsontheconductivityofthefillers,butalsodependsonthedispersionandmorphologyofthefillersinthepolymermatrix.Therefore,itisaneasyandefficientwaytoimprovetheelectricalpropertiesofCNPNbycontrollingtheirstructuresandmorphologies.Inthecurrentstudy,wegiveseveralexamplestodemonstratehowtotunethelocation,migrationandself-assemblyofcarbonaceousnanoparticlesinpolymerblendstoimprovetheirelectricalproperties.InFigurel,wepresentthevariationofACelectricalconductivityasafunctionofthecontentofthefilledoctadecylamine-functionalizedgraphene(GE-ODA)inthepolystyrene(PS),poly(methylmethacrylate)(PMMA),andblendsofPS/PMMA(50w/50w),respectively.EilItisclearthattheelectricalpercolationthresholdsofbothPS/GE-ODAandPMMA/GE-ODAcompositesareintherangeofl.5wt%and2.0wt%.However,theelectricalpercolationthresholdofPS/PMMA/GE-ODAisaslowas0.5wt%.Thereasoncanbeascribedtodoublepercolationphenomenon,thatisGE-ODAnanosheetsselectivelylocateinPSphaseandthePS/PMMAblendformsaco-continuousstructure.[2]Asaresult,onlyasmallamountofGE-ODAisneededtobuildthepercolationnetworkstructure.Ontheotherhand,alltheCNPNareelectricalisotropybecauseelectricalfillersarerandomlydistributedinthepolymermatrix.Inthecurrentstudy,wepreparedtheGE-ODA/SEBS/PP(1.50/9.85/88.65)nanocompositeswithparallelstripscomposedofGE-ODAviatheinductionofshearflow,asshownintheopticalmicrographinFigure2ac3].Thismaterialdisplaysasignificantanisotropyintheelectricalresistivity,i.e.,theelectricalresistivityofthestripesintheperpendiculardirectionis3.4X109,Q,.m,whereastheelectricalresistivityintheparalleldirectionis3.5X105,Q,.m,asshowninFigure2(b).
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上傳時間: 2013-06-26 14:47:37
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