PVDF微孔膜的制备和性能研究

发布时间：2018-03-19 15:04

本文选题：膜分离　切入点：膜技术　出处：《中国科技论文》2017年10期 　论文类型：期刊论文

【摘要】：针对聚偏氟乙烯(PVDF)膜的生产工艺中有机溶剂消耗量大、环境污染和原料浪费严重的问题,提出以绿色热致相分离法制备PVDF微孔膜的方法。该方法以聚偏氟乙烯为制膜材料,以绿色溶剂-离子液体1-丁基-3-甲基咪唑四氟硼酸盐([BMIm]BF4)为稀释剂,替代传统工艺中的有机溶剂。通过研究PVDF/[BMIm]BF4二元体系中膜的形态、晶体结构、膜的性能等探讨了改变PVDF和[BMIm]BF4二元体系中PVDF的质量分数对PVDF微孔膜的成膜过程、膜结构和膜性能的影响。研究结果表明:随PVDF质量分数增大,微孔膜纯水通量和孔隙率降低,结晶温度呈上升趋势;冷却高温的PVDF/[BMIm]BF4混合溶液将发生固-液相分离;PVDF初始质量分数的变化不会影响PVDF微孔膜的晶型结构。该研究优化了绿色热致相熔融纺丝工艺技术路线,为高分子分离膜制备提供了理论指导和技术支持。
[Abstract]:In order to solve the problems of high organic solvent consumption, environmental pollution and waste of raw materials in the production process of PVDF membrane, a green thermally induced phase separation method was proposed to prepare PVDF microporous membrane, in which polyvinylidene fluoride (PVDF) was used as the membrane material, and polyvinylidene fluoride (PVDF) was used as the membrane material. The green solvent-ionic liquid 1-#china_person0# -3-methylimidazolium tetrafluoroborate ([BMIm] BF4) was used as diluent to replace the organic solvent in the traditional process. The morphology and crystal structure of the film in the binary system of PVDF/ [BMIm] BF4 were studied. The effects of changing the mass fraction of PVDF in PVDF and [BMIm] BF4 binary system on the membrane formation process, membrane structure and membrane properties of PVDF microporous membrane were investigated. The results showed that the pure water flux and porosity of the membrane decreased with the increase of PVDF mass fraction. The crystallization temperature is on the rise and the initial mass fraction of PVDF/ microporous film will not be affected by the change of the initial mass fraction of solid-liquid phase separation in the mixed solution of PVDF/ [BMIm] BF4 at high temperature. This study has optimized the technological route of green thermal phase melt spinning. It provides theoretical guidance and technical support for the preparation of polymer separation membranes.
【作者单位】：天津工业大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51273147) 高等学校博士学科点专项科研基金资助项目(20121201120002)
【分类号】：TQ051.893

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