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

資料類(lèi)型：

PDF文件

關(guān)鍵詞：

Multi-Iayer extrusion Conductive polymer composites Morphology in
situ Fibrillation

資料大小：

97K

所屬學(xué)科：

分子表征

來(lái)源：

第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集（2013.6.2-6 武漢）

簡(jiǎn)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

上傳時(shí)間：

2013-06-26 16:05:26

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