Preparation of Ethylene Chlorotrifluoroethylene Co-polymer Membranes via Thermally Induced Phase Separation

doi:10.7503/cjcu20120033

Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (11): 2585.doi: 10.7503/cjcu20120033

• Polymer Chemistry • Previous Articles Next Articles

Preparation of Ethylene Chlorotrifluoroethylene Co-polymer Membranes via Thermally Induced Phase Separation

ZHOU Bo, LIN Ya-Kai, MA Wen-Zhong, TANG Yuan-Hui, TIAN Ye, WANG Xiao-Lin

Beijing Key Laboratory of Membrane Materials and Engineering, Tsinghua University, Beijing 100084, China

Received:2012-01-09 Online:2012-11-10 Published:2012-10-15

Abstract

Abstract:

Microporous ethylene chlorotrifluoroethylene co-polymer(ECTFE) membrane was prepared via thermally induced phase separation(TIPS) method. By an analysis of interaction parameter, compatibility of ECTFE/diluent systems and the membrane cross-section morphologies, the liquid-liquid phase separation was found during the TIPS process when diethyl phthalate(DEP) was chosen as a diluent. The thermodynamic phase diagram confirms that a large liquid-liquid phase separation region for the ECTFE/DEP system was observed. The monotectic point of this system appeared at a high polymer concentration which was approximately up to 55%. Moreover, the effects of the cooling temperature and coarsening time on membrane structure, porosity, and tensile strength were also investigated. The results showed that a faster cooling rate and shorter coarsening time at 458 K led to membranes with smaller pore size.

Key words: Thermally induced phase separation, Ethylene chlorotrifluoroethylene co-polymer, Microporous membrane, Diethyl phthalate

CLC Number:

O631.1

TrendMD:

ZHOU Bo, LIN Ya-Kai, MA Wen-Zhong, TANG Yuan-Hui, TIAN Ye, WANG Xiao-Lin. Preparation of Ethylene Chlorotrifluoroethylene Co-polymer Membranes via Thermally Induced Phase Separation[J]. Chem. J. Chinese Universities, 2012, 33(11): 2585.

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Preparation of Ethylene Chlorotrifluoroethylene Co-polymer Membranes via Thermally Induced Phase Separation

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