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

資料類(lèi)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(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：

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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