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Structure and Properties of Poly( vinylidene fluoride) Nanocomposites Based on the Ionic Liquid Coated Carbon Nanotubes  
Structure and Properties of Poly( vinylidene fluoride) Nanocomposites Based on the Ionic Liquid Coated Carbon Nanotubes
資料類型： PDF文件
關(guān)鍵詞： nanocomposites  ionic  liquid  carbon  nanotubes  crystal  structure  
資料大小： 106K
所屬學(xué)科： 分子表征
來源： 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：
Poly(vinylidenefluoride)(PVDF)isacrystallinepolymerhavingalowglasstransitiontemperature(-350C).Itissuperiorinheatresistance,chemicalresistance,mechanicalproperties,abrasionresistance,flameretardancyandweatherability.PVDFexhibitsspecificelectricalpropertiesbecauseofthehighpolarCF2bondsinitsmolecularstructure.Inthiswork,aroomtemperatureionicliquid(11),1-butyl-3-methylimidazoliumhexafluorophosphate[BMIM][PF6],carbonnanotubes(CNT),andtheILcoatedCNTs(IL-CNTs)havebeenusedtomodifypoly(vinylidenefluoride)(PVDF)cl,2].Thestructure,crystalforms,andpropertiesoftheobtainednanocompositeshavebeeninvestigatedsystematically.ItwasfoundthattheincorporationofILintothePVDFleadstodrasticallyincreasedycrystalformsofPVDFbytheinteractionbetweenthe-CF2-andcationicions.PristineCNTsacceleratethecrystallizationofPVDFasanefficientnucleationagent,whiletheformedcrystalsaremainlynonpolaracrystalformwithfewpolarpcrystals.TheionicliquidandCNTsshowsignificantsynergeticeffectsonboththenucleationandtheformationofpolarpcrystalsforPVDFbythemeltcrystallization.TheadditionofIL-CNTsnotonlyimprovestheCNTsdispersioninPVDFmatrix,butalsoincreasestheoverallcrystallizationrateofPVDFdrastically.Moreimportant,themelt-crystallizedPVDFnanocompositeswithIL-CNTsshowioo%polarppolymorphsbutnoacrystalforms.TheILtoCNTsratioandtheIL-CNTsloadingcontenteffectsonthecrystallizationbehaviorsofPVDFinthenanocompositeswerealsostudied.Itisconsideredthatthespecificinteractionsbetween-CF2-withtheplanarcationicimidazoliumringwrappedontheCNTssurfaceleadtothefullzigzagconformationsofPVDF,thusthenucleationinpolarcrystals(pforms)latticeisachievedandfullpolarpformscrystalsareobtainedbythesubsequentcrystalgrowthfromthenuclei.Moreover,itwasfoundthatthePVDF/IL-CNTsnanocompositesshowlowermodulus,buthigherelongationatbreakthanthePVDF/CNTscompositesatthesameloadingcontent.
作者： C. Y. Xing, Y. J. LI
上傳時(shí)間： 2013-06-27 14:10:42
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