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首页> 外文期刊>Separation and Purification Technology >Preparation of PVDF hollow fiber membrane from a ternary polymer/solventonsolvent system via thermally induced phase separation (TIPS) method
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Preparation of PVDF hollow fiber membrane from a ternary polymer/solventonsolvent system via thermally induced phase separation (TIPS) method

机译：通过热诱导相分离（TIPS）方法从三元聚合物/溶剂/非溶剂体系制备PVDF中空纤维膜

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摘要

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/solventonsolvent 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.
机译：通过热致相分离（TIPS）工艺成功地从包括PVDF，溶剂和非溶剂的三元体系中成功制备了多孔聚偏二氟乙烯PVDF中空纤维膜。本研究使用甘油三乙酸酯（triacetin）作为溶剂，甘油作为非溶剂。研究了非溶剂浓度对聚合物/溶剂/非溶剂相图的影响。甘油的加入引起了相分离机理的变化，从固液分离（聚合物结晶）到液液相分离。基于这些结果，制造了中空纤维膜。研究了非溶剂浓度，气隙距离和水浴温度对制备的膜的形貌，透水性，溶质截留率和强度的影响。使用较短的气隙距离，较高的浴温和较高的甘油浓度可有效获得较高的水渗透性。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。观察到改变的聚合物挤出温度对具有晶体结构和互连结构的膜的膜渗透性具有不同的影响。另外，将由PVDF /三醋精/甘油系统制备的膜的性能与由PVDF /三醋精系统制备的膜的性能进行了比较。

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