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Manipulation of Poly( vinylidene fluoride) Polymorphism in PVDF/GO Nanocomposite during Melt Crystallization

資料類型：

PDF文件

關(guān)鍵詞：

poly(vinylidene fluroride) graphene oxide crystallization cetyltrimethyl ammomum
broe gamma phase

資料大?。?/td>

106K

所屬學(xué)科：

分子表征

來源：

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

簡介：

Poly(vinylidenefluoride)(PVDF)cancrystallizeintoatleastfourpolymorphs(a,(3,y,and8),itspolar(3and‘yphaseshavepyroelectricity,piezoelectricity,andferroelectricity,whichgiverisetomanypotentialapplicationscl].ManipulatingpolymorphismofPVDFbymediatingthepolymer-GOinteractionsinPVDF/GOnanocompositeisimportantfortheapplicationofitspromisingpropertiesaswellasunderstandingofdifferentstrengthinteractionsonthecrystallizationprocessofPVDF.Inthiswork,weusedwide-angleX-raydiffraction(WAXD)andFourierTransformationInfraredSpectroscopy(FTIR)toinvestigatethecrystallinestructureofsolutionandmeltcrystallizationPVDFanditisshownthatGOplateletsinduceformationof‘yphasewhencrystallizingfromsolution,butonlyaphaseformsfrommeltcrystallization.ThecrystallizationkineticsofaphaseispromotedduetoheterogeneousnucleationabilityofGO,whichprobablyoriginsfromaweak7c一dipoleinteractionbetweenGOandPVDF.Interestingly,afterintroductionofastrongion-dipoleinteractionsbetweenGOandPVDFbyadditionofanionicsurfactant(cetyltrimethylammoniumbromide,CTAB),asignificantamountof‘ycrystalsareobtainedduringisothermalmeltcrystallization.Time-resolvedFourierTransformationInfraredSpectroscopyresultsfurtherprovideadetailevolutionof‘yphaseformation,andtherearedistincttwostagesduringthemeltcrystallizationinthePVDF/GOcompositesinthepresenceofCTAB,i.e.,asimultaneousgrowthof‘yandaphasesinthefirststageandasolidato‘ytransitioninthesecondstage.Foreachstage,generalized2Dcorrelationanalysisisusedtorevealthespecificsequenceoccurringofalphaandgammaconformation,i.e.,alphaconformationchangespriortogammaconformationinthefirststageanditisreversedinthesecondstage.Itisclearlydemonstratedthat,bymediatingthePVDF-GOinteractionsthroughtheintroductionofasurfactants,controloverthestructuredevelopmentcanbeachieved.

作者：

Y. Li, X. Huan, G. J. Zhong

上傳時(shí)間：

2013-07-02 15:38:22

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