电场诱导聚偏氟乙烯溶液结晶性能的研究.pdfVIP

电场诱导聚偏氟乙烯溶液结晶性能研究 柏自奎 屈永明刘 欣杨 红军方 东 许杰 徐卫林 武汉纺织大学，材料科学与工程学院，武汉市，430073 摘要：在高压静电场作用下聚偏氟乙烯(PVDF)溶液流延膜，直到溶剂完全挥发，并采用XRD 和FTIR测试方法，研究了该膜晶相结构的变化.结果表明，高压静电场的诱导作用增大了 PVDF膜中β晶相的比例，该方法是制备的高压电常数d33PVDF膜的简单高效的方法。 关键词：聚偏氟乙烯 ; 电场 ; β晶相 Crystallizationofpolyvinylidenefluoridefromsolutionsinducedby Electricfield BAIZikuiQUYongmingXUJieFANGDongXUWeilin CollegeofMaterialsScienceandEngineering,WuhanTextileUniversity,Wuhan430073 Abstract:Polyvinylidenefluoride(PVDF)hasbeenextensivelystudiedduetotheirexcellent piezoelectricpropertyoverthelastthreedecades.PVDFisfamousforitsmultiplecharacterswith fourdifferentcrystallineformsi.e.,α、β、γandδ.Thesecrystallinephasescouldbetransformedinto eachotherunderspecificconditions.Inallphases,theβ-PVDFexhibitsverygoodpiezoelectric propertysoitisutilizedtofabricatehighβ-phasePVDFforbeingusedinsensorsandstorage devices.Ingeneral,β-PVDFisobtainedbyuniaxialstretching,elevatedpressurecrystallization, highelectricfieldpolarization,andsolutioncrystallization.Thesemethodsoftenneededharsh conditionsorcausedthestructuraldeformationofPVDFfilm.Inthispresentstudy,wereporteda facileapproachtofabricateβ-PVDFfilmbypolyvinylidenefluoridesolutioncongealinginthe effectofelectricfield.ThecrystallizationcharacteristicoftheobtainedPVDFfilmwasstudiedby meansofXRDandFTIR.TheresultsshowthattheβcrystallinephaseincreasedinPVDFfilmby electricfieldinducement,whichformationmechanismwasdiscussed.Theobtainedβ-PVDFfilm wouldhashighPiezoelectriccoefficientd33,extendingtheapplicationofPVDFfilm.Theelectric fieldinducementofthesolutionisapromisingmethod. Keywords:Polyvinylidenefluoride ; electricfield ; β crystallinephase