热拉伸温度对聚偏氟乙烯微孔膜结构与性能的影响  

Effect of Hot-Stretching Temperature on Structure and Properties of Poly(vinylidene fluoride)Microporous Membranes

作　　者：高志浩 张健敏 门树林 温荣严 骆林 戴作强[1] Zhihao Gao;Jianmin Zhang;Shulin Men;Rongyan Wen;Lin Luo;Zuoqiang Dai(College of Mechanical and Electrical Engineering,National Engineering Research Center for Intelligent Electrical Vehicle Power System,Qingdao University,Qingdao 266071,China)

机构地区：[1]青岛大学机电工程学院电动汽车智能化动力集成技术国家地方联合工程研究中心,山东青岛266071

出　　处：《高分子材料科学与工程》2021年第10期119-125,131,共8页Polymer Materials Science & Engineering

基　　金：中国博士后科学基金面上项目(2017M622133);山东省自然科学基金资助项目(ZR201709240128);青岛市科技计划项目青年专项(18-2-2-3-jch)。

摘　　要：采用熔体挤出拉伸法以高、低分子量混合聚偏氟乙烯(PVDF)为原料制备微孔膜,研究了不同热拉伸温度对PVDF微孔膜表面形貌及结晶行为的影响,通过扫描电子显微镜、红外光谱仪、X射线衍射仪和差示扫描量热仪等测试手段分别对微孔膜的形态、结构、晶型进行表征。结果表明,热拉伸温度对PVDF微孔膜的成孔形貌、孔隙率、结晶度及β相含量均有影响。热拉伸温度为80℃时,微孔膜结晶度为58.86%,β相的相对含量最高达到42.50%,此时微孔膜的力学性能最佳;而当热拉伸温度为120℃时,PVDF微孔膜的成孔分布更加均匀,其孔隙率可达到最大值31.51%。Poly(vinylidene fluoride)(PVDF)microporous membranes were fabricated via melt extrusion-stretching method(MES)using high and low molecular weight PVDF mixture as raw material.The effect of hot-stretching temperature during hot-stretch step on the surface morphology and crystallization behavior of PVDF microporous membranes were investigated by SEM,FT-IR,XRD,differential scanning calorimetry(DSC)and so on.The results indicate that hot-stretching temperature has profound influences on the pore morphology,porosity,crystallinity and content ofβphase.When the stretching temperature is 80℃,the crystallinity of microporous membranes is 58.86%,and the relative content ofβphase increases to 42.50%,the microporous membranes exhibit the best mechanical properties.When the stretching temperature rises to 120℃,the amount and uniformity of pores are greatly improved.The porosity of microporous membrane can reach as high as 31.51%.

关 键 词：聚偏氟乙烯微孔膜 热拉伸温度 β相含量 孔隙率 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]