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Some basic research progress for the formation of polymeric membranes
Authors： REN Jizhong DENG Maicun
Units： Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
KeyWords： polymeric membrane; membrane morphology; macrovoid; thickness-gradient membrane; rheology
ClassificationCode：TQ028.8
year,volume(issue):pagination： 2011, 31(3):39-46

Abstract：

Some basic research progress for the formation of polymeric membranes by immersion precipitation method is reviewed. The approaching ratio and the approaching coagulant ratio are used to describe the thermodynamic state of the casting solution and the precipitation property of the coagulant. The membrane formation process is described with two macroscopic time scales, delay time and gelation time, and “viscous fingering” is used to explain the formation of macrovoids. The transition of membrane morphology between sponge-like and sponge-like structure is reviewed by changing the approaching ratio and membrane thickness. For the preparation of flat sheet and hollow fiber membranes, the rheological characteristics of the dope solution strongly influence the membrane morphology and its performance. According to Extreme model, the pore size distribution parameters and molecular weight cut-off is coupled together, which is useful for the characterizing the membrane performance.

Funds：
863基金项目(2008AA06Z325)和科技部国际合作项目(2009DFA61700)支持

AuthorIntro：
任吉中（1970-）,男,河南新野人,博士,研究员,从事膜制备与膜分离过程研究.*通讯联系人(renjizhong@dicp.ac.cn)

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