The Electrical Conductive Network Architecture of PP/PA6/CB Composites through Morphology Development during Layer-multiplying Extrusion，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）-中国聚合物网,论文下载

The Electrical Conductive Network Architecture of PP/PA6/CB Composites through Morphology Development during Layer-multiplying Extrusion

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关键词：

Multi-Iayer extrusion Conductive polymer composites Morphology in
situ Fibrillation

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97K

所属学科：

分子表征

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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：

Theconductivepolymercompositesareakindofthemostimportantfunctionalpolymermaterials.Inthecomposites,carbonblackisawideusedconductivefiller.TheformationofconductivenetworkofCBplaysanimportantroleinthehighconductivityofCBfilledcomposites.TheproblemishowtoformthenetworklinkofCBparticlesatlowcontentofCBsoastobalancetheotherpropertiessuchasmechanicalpropertiesandprocessingbehaviorandcost.ThekeyroutefordecreasingtheelectricalpercolationthresholdistheselectivedispersionofCBinonephaseofpolymerblends.Inthispaper,theconductivepolypropylene(PP)compositesweredesignedtoalternativelayercomposites,inwhichonelayerisconductivePPcomposites,andanotherisPPorPP/nylon6blends.Thenylon6filled-polypropylene(PA6-PP,denotedasA)/carbonblackfilled-polypropylene(CB-PP,denotedasB)alternatingmultilayercompositeswerepreparedthroughlayer-multiplyingextrusion,byutilizingtwoextruderscombinedwithanassemblyoflayer-multiplyingelements(LMEs).AandBwereextrudedfromdifferentextrudersandcombinedasa2-layermeltinthecoextrusionblock,thenflowedthroughnLMEsforming2n+llayerslikeA(BA)nB.Effectsoflayernumber,effectsofnylonphaseandsecondarymeltprocessingontheelectricalpercolationofCBwerestudied.Thescanningelectronmicrographs(SEM)showthatwiththeincreaseoflayernumbers,PA6fibrillizedalongextrusiondirection(ED),andpartsofCBparticlesmigratedtowardadjacentalayersandadheredtothesurfacesofPA6fibrilsaroundinterfaces.Theresultofvolumeresistivityindicatedthatcomparedwiththecasealongtransversedirection,theresistivityalongEDwasdecreaseddistinctlyaslayernumberbeyond64.ItrevealedthattheorientationofPA6phaseandthemigrationofCBparticlesacceleratedtheformationofconductivechannelsalongED.Forforminga3DconductivenetworkinthematrixandpromotingmoreCBparticlestobeabsorbedonthePA6fibrils,themultilayersamplesexperiencedasecondaryblendingprocessinginaninternalmixerat1950C,whichwasbetweenthemeltingtemperatureofPPandPA6.Itwasfoundthatwithincreasingtheconcentrationofnylonphase,asignificantdecreaseofvolumeresistivitywasobservedalongrandomdirections.SEMimagesshowthattheoriginalorientationofPA6fibrilsalongEDdisappeared,whiletheirsurfaceswerecoveredwithalargenumberofCBparticles.Theseresultssuggestedthatadesired3Dconductivenetworkwasformedintheblendedsystem.

作者：

S. Y. Guo, J. B. Shen, J. Li

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2013-06-26 16:05:26

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