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

資料類型：

PDF文件

關鍵詞：

nanocomposites ionic liquid carbon nanotubes crystal structure

資料大小：

106K

所屬學科：

分子表征

來源：

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

簡介：

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

上傳時間：

2013-06-27 14:10:42

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