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Manipulation of Poly( vinylidene fluoride) Polymorphism in PVDF/GO Nanocomposite during Melt Crystallization  
Manipulation of Poly( vinylidene fluoride) Polymorphism in PVDF/GO Nanocomposite during Melt Crystallization
資料類型: PDF文件
關鍵詞: poly(vinylidene  fluroride)  graphene  oxide  crystallization  cetyltrimethyl  ammomum  
broe  gamma  phase  
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)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
上傳時間: 2013-07-02 15:38:22
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