STUDY ON MICROSTRUCTURES OF POLYACRYLONITRILE MEMBRANES PRODUCED BY NON-SOLVENT INDUCED PHASE SEPARATION
In modern world polymeric membranes are widely used in industry. Examples of industrial applications are microfiltration, ultrafiltration, reverse osmosis and gas separation. There are several ways to prepare porous polymeric membranes. Phase separation processing is the widety used one. Techniques such as temperature and non-solvent-induced phase separation (TIPS and NIPS) have been developed to obtain polymer solution in two phases, a polymer-rich and a polymer lean phase. Phase separation originates in TIPS from heat transfer generated by a rapid cooling down of the polymeric solution and in NIPS from mass transfer produced by exchange occurring between solvent and non-solvent. In fact, there are different ways to phase separation by NIPS according the non-solvent physical state, i.e. liquid non-solvent-induced phase separation (LIPS) and vapor-induced phase separation (VIPS). The latter method, first patented in 1922 for the preparation of cellulose ester membrane , consists of the exposure of the cast film to a nonsolvent containing atmosphere prior to immersion in a coagulation bath. Although most commercially available membranes are fabricated using LIPS, VIPS can be regarded as a technique of interest to produce membranes of various kinds of morphologies.
Xiaolan Yu Songmiao Liang Jian Xu Hongjun Dai Xiaoli Zhang
State Key Laboratory of Polymer Physics and Chemistry,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
国际会议
International Symposium on Polymer Physics(2008年国际高分子物理学术会议PP2008)
厦门
英文
77-78
2008-06-08（万方平台首次上网日期，不代表论文的发表时间）