Preparation of polymer blend hollow fiber membrane via thermally induced phase separation
Preparation of polymer blend hollow fiber membrane via thermally induced phase separation
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DOI：
10.1016/j.seppur.2006.05.018
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发表时间：
2006-12-01
影响因子：
8.6
通讯作者：
Nagai, Hideki
中科院分区：
文献类型：
--
作者：
Fu, Xunyao;Matsuyama, Hideto;Nagai, Hideki
采用热致相分离法（TIPS）制备了聚合物共混中空纤维膜.聚乙烯醇缩丁醛（PVB）和乙烯-乙烯醇共聚物（EVOH）用作聚合物，稀释剂为分子量为200的聚乙二醇（PEG）。在聚合物共混体系中得到的相图表明，UCST（上临界溶液温度）和LCST（下临界溶液温度）行为。对于LCST行为，存在两种类型的相分离。认为在较高温度下发生相分离的是PVB和EVOH之间的相分离，而在较低温度下发生相分离的是聚合物和稀释剂之间的相分离。EVOH的加入对中空纤维膜的结构和膜性能有显著的影响。随着共混体系中EVOH含量的增加，膜的亲水性增强，同时膜的孔径增大，透水性提高。EVOH的加入也有效地改善了中空纤维膜的力学性能。(c)2006 Elsevier B. V.保留所有权利。
Polymer blend hollow fiber membranes were prepared via thermally induced phase separation (TIPS). Poly(vinyl butyral) (PVB) and poly (ethylene-co-vinyl alcohol) (EVOH) were used as polymers and diluent was polyethylene glycols (PEG) with the molecular weight of 200. The phase diagrams obtained in the polymer blends system indicated both UCST (upper critical solution temperature) and LCST (lower critical solution temperature) behaviors. For LCST behavior, there were two kinds of phase separations. It was considered that the phase separation occurred at higher temperature was between PVB and EVOH, and that occurred at lower temperature was between polymer and diluent. The addition of EVOH had an eminent effect on the hollow fiber membrane structure and membrane performance. With the increase of EVOH content in the polymer blend system, the membrane became more hydrophilic, and the water permeability became higher due to the enlargement of the pores. The addition of EVOH was also effective to improve the mechanical property of hollow fiber membrane. (c) 2006 Elsevier B.V. All rights reserved.