Preparation of PVDF hollow fiber membrane from a ternary polymer/solvent/nonsolvent system via thermally induced phase separation (TIPS) method
Preparation of PVDF hollow fiber membrane from a ternary polymer/solvent/nonsolvent system via thermally induced phase separation (TIPS) method
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DOI：
10.1016/j.seppur.2008.05.027
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发表时间：
2008-10-22
影响因子：
8.6
通讯作者：
Matsuyama, Hideto
中科院分区：
文献类型：
--
作者：
Rajabzadeh, Saeid;Maruyama, Tatsuo;Matsuyama, Hideto
以聚偏氟乙烯（PVDF）、溶剂和非溶剂为原料，采用热致相分离（TIPS）工艺制备了PVDF中空纤维多孔膜。本研究以三醋酸甘油酯为溶剂，甘油为非溶剂。研究了非溶剂浓度对聚合物/溶剂/非溶剂相图的影响。甘油的加入使相分离机理从固-液相分离（聚合物结晶）转变为液-液相分离。基于这些结果，制备中空纤维膜。研究了非溶剂浓度、气隙距离和水浴温度对膜的形貌、透水性、截留率和强度的影响。采用较短的气隙距离、较高的浴温和较高的甘油浓度可有效地获得较高的透水性。在另一组实验中，研究了聚合物挤出温度对中空纤维膜的形态和渗透性的影响。据观察，改变聚合物挤出温度对具有结晶和互连结构的膜的膜渗透性具有不同的影响。此外，还比较了PVDF/甘油三醋酸酯体系和PVDF/甘油三醋酸酯体系制得的膜的性能。(C)2008 Elsevier B. V.保留所有权利。
Porous poly (vinylidene fluoride) PVDF hollow fiber membranes were successfully prepared from a ternary system including PVDF, solvent and nonsolvent via thermally induced phase separation (TIPS) process. Glycerol triacetate (triacetin) as solvent and glycerol as nonsolvent were used in this study. The effect of nonsolvent concentration on polymer/solvent/nonsolvent phase diagram was studied. The addition of glycerol brought about the change of phase separation mechanisms from the solid-liquid phase separation (polymer crystallization) to liquid-liquid phase separation. Based on these results, hollow fiber membranes were fabricated. Effects of nonsolvent concentration, air gap distance and water bath temperature on morphology, water permeability, solute rejection and strength of fabricated membranes were studied. Using shorter air gap distance, higher bath temperature and higher glycerol concentration were effective to obtain higher water permeability. In another set of experiments, the effect of polymer extrusion temperature on morphology and permeability of the hollow fiber membrane was studied. It was observed that changing polymer extrusion temperature had different effects on membrane permeabilities for both membranes with crystalline and interconnected structures. In addition, the performance of membranes prepared from PVDF/triacetin/glycerol system was compared with that prepared from PVDF/triacetin system. (C) 2008 Elsevier B.V. All rights reserved.