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The Electrical Conductive Network Architecture of PP/PA6/CB Composites through Morphology Development during Layer-multiplying Extrusion  
The Electrical Conductive Network Architecture of PP/PA6/CB Composites through Morphology Development during Layer-multiplying Extrusion
资料类型: PDF文件
关键词: Multi-Iayer  extrusion  Conductive  polymer  composites  Morphology  in  
situ  Fibrillation  
资料大小: 97K
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:
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
上传时间: 2013-06-26 16:05:26
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