热致相分离法制备聚氯乙烯微孔膜及其结构控制与性能研究
作者:闵 瑛,张春芳,白云翔,孙余凭,顾 瑾 
单位: 江南大学化学与材料工程学院,无锡214122
关键词: 聚氯乙烯;热致相分离;微孔膜
分类号: TQ027.3
出版年,卷(期):页码: 2016,36(6):36-41

摘要:
 选用二苯醚(DPE)为稀释剂,通过热致相分离(TIPS)法制备了聚氯乙烯(PVC)微孔膜. 从热力学和动力学两方面,研究了聚合物浓度、冷却速率等因素对体系相分离行为和膜结构的影响. 结果表明:在TIPS法制备PVC微孔膜的过程中,PVC/DPE体系发生液-液相分离,膜孔呈现典型的蜂窝状结构. 聚合物浓度或冷却速率的减小,都有利于稀释剂富相液滴的生长并促进液滴尺寸的增大,进而引起膜孔径和纯水通量的增大,并导致其机械性能的减弱.
 Microporous polyvinyl chloride (PVC) membranes were prepared via thermally induced phase separation (TIPS) process using diphenyl ether (DPE) as diluent. In order to understand the influences of polymer concentration and cooling rate on phase behavior and membrane structure, the thermodynamic and kinetics properties of membrane formation process were investigated by optical microscope. The resulting PVC microporous membranes presented symmetric cellular structure, which is typical results of liquid-liquid phase separation. The decrease of polymer concentration and cooling rate facilitated the growth of droplet phase and increased the size of droplets. The results matched with the pore size of the obtained PVC membranes. Correspondingly, PVC membranes possessed higher water flux and worse mechanical properties when lower polymer concentration and higher cooling bath temperature were submitted to experiment.

基金项目:
基金项目:国家自然基金项目(21576114)

作者简介:
第一作者简介:闵 瑛(1991-),湖北黄石市人,硕士生,主要从事膜材料制备及应用研究. *通讯作者,E-mail: gujin@jiangnan.edu.cn

参考文献:
 [1] 江苏省氯碱工业协会. 中国聚氯乙烯产业可持续健康发展讨论[J]. 江苏氯碱, 2012, 5, 1-3. 
[2] Bodzek M, Konieczny K. The influence of molecular mass of poly(vinyl chloride) on the structure and transport characteristics of ultrafiltration membranes[J]. J Membr Sci, 1991, 61, 131-156.
[3] 杨建, 赵文明, 王晓琳. 聚偏氟乙烯-稀释剂间介电常数差异对热致相分离法制膜微观结构的影响[J]. 高等化学学报, 2007, 12, 2413-2417.
[4] Yoon J, Lesser A J, McCarthy T J. Locally anisotropic porous materials from polyethylene and crystallizable diluents[J]. Macromolecules, 2009, 42(22), 8827-8834.
[5] 王刚, 林亚凯, 王晓琳. 混合稀释剂对热致相分离法制备等规聚丙烯微孔膜的影响[J]. 膜科学与技术, 2007, 27(6), 42-51.
[6] Shang M X, Matsuyama H, Teramoto M, et al. Preparation and membrane performance of poly(ethylene-co-vinyl alcohol) hollow fiber membrane via thermally induced phase separation[J]. Polymer, 2003, 44(24), 7441-7447.
[7] 张昊, 李香玲, 胡晓宇. TIPS法力化学改性聚氯乙烯膜研究[J]. 功能材料, 2012, 24(43), 3410-3416.
[8] McGuire K S, Laxminarayan A, Lloyd D R. Kinetics of droplet growth in liquid-liquid phase separation of polymer-diluent systems: experimental results[J]. Polymer, 1995, 36(26), 4951-4960.
[9] Li J F, Xu Z L, Yang H. Microporous polyethersulfone membranes prepared under the combined precipitation condition with non-solvent additives[J]. Polym Advan Technol, 2008, 19(4), 251-257. 
[10] Song S W, Torkelson J M. Coarsening effect on microstructure formation in isopycnic polymer solutions and membranes produced via thermally induced phase separation[J]. Macromolecules, 1994, 27(22), 6389-6397.
[11] Qiu Y R, Matsuyama H, Gao G Y, et al. Effects of diluent molecular weight on the performance of hydrophilic poly(vinyl butyral)/Pluronic F127 blend hollow fiber membrane via thermally induced phase separation[J]. J Membr Sci, 2009, 338(1-2), 128-134.
 

服务与反馈:
文章下载】【加入收藏

《膜科学与技术》编辑部 地址:北京市朝阳区北三环东路19号蓝星大厦 邮政编码:100029 电话:010-80492417/010-80485372 传真:010-80485372邮箱:mkxyjs@163.com

京公网安备11011302000819号