Structure and Properties of Poly( vinylidene fluoride) Nanocomposites Based on the Ionic Liquid Coated Carbon Nanotubes，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

Structure and Properties of Poly( vinylidene fluoride) Nanocomposites Based on the Ionic Liquid Coated Carbon Nanotubes

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PDF文件

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nanocomposites ionic liquid carbon nanotubes crystal structure

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106K

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：

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

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2013-06-27 14:10:42

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