| 聚合物分子量对浸没沉淀法制备PVDF微孔膜结构与结晶的影响 |
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| 引用本文： | 王许云,赵书菊,张林,陈欢林.聚合物分子量对浸没沉淀法制备PVDF微孔膜结构与结晶的影响[J].高分子材料科学与工程,2010(9). |
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| 作者姓名： | 王许云 赵书菊 张林 陈欢林 |
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| 作者单位： | 青岛科技大学化工学院;浙江大学化学工程与生物工程学系; |
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| 基金项目： | 国家支撑计划项目(2006BAB03A06); 中央高校基本科研业务费专项资金资助(KYJD09011); 山东省泰山学者建设工程项目(JS200510036) |
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| 摘 要： | 聚合物的分子量对浸没沉淀法制备聚偏氟乙烯(PVDF)微孔膜结构和结晶具有较大影响。随着聚合物分子量的增大,所成膜上表面孔尺寸和孔密度有减小的趋势。分子量较大的PVDF所成膜的底面及膜内指状孔表面均为完全无孔致密结构。断面指状孔下方为相互连通的海绵状结构。当聚合物的分子量较低时,断面开始由相互连通的海绵状结构向胞腔状结构过渡。由低分子量的PVDF制得的膜,结晶类型既有α型结晶,又有β型结晶。由高分子量的PVDF制得的膜,主要为α型PVDF结晶。后者的结晶度明显大于前者。
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| 关 键 词： | 聚偏氟乙烯 相转化 分子量 结晶 |
Effect of Polymer Molecular Weight on the Morphology and Crystallization of Prepared PVDF Membranes |
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| WANG Xu-yun,ZHAO Shu-ju,ZHANG Lin,CHEN Huan-lin.Effect of Polymer Molecular Weight on the Morphology and Crystallization of Prepared PVDF Membranes[J].Polymer Materials Science & Engineering,2010(9). |
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| Authors: | WANG Xu-yun ZHAO Shu-ju ZHANG Lin CHEN Huan-lin |
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| Affiliation: | WANG Xu-yun1,2,ZHAO Shu-ju1,ZHANG Lin2,CHEN Huan-lin2(1. College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China,2. Department of Chemical Engineering and Biological Engineering,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | Polyvinylidene fluoride(PVDF) membranes were prepared by immersion precipitation method. Effect of the polymer molecular weight (M-v) on the morphology and crystallization of prepared membranes was examined. With the M-v increasing of the polymer,the mean pore size and pore density of the top surface of the prepared membranes have the tendency of decrease. For PVDF with high M-v,the morphology of the prepared membrane is fingerlike structures with sponge substrate beneath the dense skin in cross section. Fo... |
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| Keywords: | PVDF phase inversion molecular weight crystal |
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