热致相分离法制备聚偏氟乙烯中空纤维微孔膜
作者:安亚欣12,李凭力12?,吴浩赟12,常贺英1
单位: 1.天津大学化工学院,天津300072;
关键词: 热致相分离法;聚偏氟乙烯;中空纤维膜;结构;性能
分类号: TQ028.8
出版年,卷(期):页码: 2013,33(6):13-19

摘要:
本文从聚偏氟乙烯(PVDF)/三乙酸甘油酯(GTA)/癸二酸二丁酯(DBS)体系中,采用热致相分离法,制备聚偏氟乙烯(PVDF)中空纤维微孔膜。研究了铸膜液的组成:混合稀释剂中GTA的含量、PVDF含量,和纺丝条件:空气隙距离、水浴温度、挤出温度,对PVDF中空纤维膜的结构和性能的影响。结果表明:随着混合稀释剂中的GTA质量分数从30%增加至50%,膜的断面由双连续结构转变为变形的球晶与双连续共存的结构。低的PVDF含量、长的空气隙距离、高的水浴温度,均利于膜水通量的提高,但膜对牛血清蛋白的截留率下降,拉伸强度减小。挤出温度升高,膜的水通量先增加后减小,截留率和拉伸先减小后增加。
Poly(vinylidene fluoride) (PVDF) hollow fiber microporous membrane was prepared using mixed diluent of glyceryl triacetate (GTA) and dibutyl sebacate (DBS) via thermally induced phase separation (TIPS). A systematic study was carried out to investigate effects ofthe components of casting membrane solution: GTA content in mixed diluent, PVDF content in the casting membrane solution, and spinning parameters: water bath temperature, air-gap distance, extruding temperatureon the structure and performance of PVDF hollow fiber membrane. It was found that the cross section of membrane changed from interconnected structure into the combination of spherulitic and interconnected structure as GTA mass content in the mixed diluent increased from 30% to 50%. The water flux of PVDF hollow fiber membrane increased as PVDF mass content in the casting membrane solution decreased, the air-gap distance increased, or the water bath temperature increased, however, the solution rejection and the tensile strength of PVDF hollow fiber membrane decreased. As the extruding temperature increased, the water flux of PVDF hollow fiber membrane increased firstly and then decreased, while thesolution rejection and the tensile strength of PVDF hollow fiber membrane decreased firstly and then increased.

基金项目:

作者简介:
安亚欣(1989-),女,河北石家庄人,在读硕士,从事高分子膜的研究。?通讯联系人tdlpl@163.com

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