Formation of crystalline EVAL membranes by controlled mass transfer process in water–DMSO–EVAL copolymer systems

doi:10.1016/S0376-7388(98)00063-5

淡江大學機構典藏 > 工學院 > 化學工程與材料工程學系暨研究所 > 期刊論文 > Item 987654321/44168

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題名:	Formation of crystalline EVAL membranes by controlled mass transfer process in water–DMSO–EVAL copolymer systems
作者:	鄭廖平;Cheng, Liao-ping;Young, Tai-horng;You, Wei-ming
貢獻者:	淡江大學化學工程與材料工程學系
關鍵詞:	EVAL;Crystallization;Liquid–liquid demixing;Immersion–precipitation;Diffusion
日期:	1998-06
上傳時間:	2010-03-09 10:00:10 (UTC+8)
出版者:	Amsterdam: Elsevier BV
摘要:	The effect of solvent content in the coagulation bath on the formation of poly(ethylene-co-vinyl alcohol) (EVAL) membranes by isothermal immersion–precipitation in water–dimethylsulfoxide (DMSO)–EVAL system has been investigated. As a homogeneous EVAL dope is immersed in a harsh bath, e.g., water, instant precipitation occurs initiated by the liquid–liquid demixing process. The formed membrane exhibits an asymmetric morphology with extensive finger-like macrovoids, similar to that observed in most amorphous polymeric membranes. On the other hand, if precipitation takes place in a soft bath containing a substantial amount of solvent, crystallization, rather than liquid–liquid demixing, starts to dominate and a skinless, bi-continuous, particulate membrane becomes the precipitated product. The immersion–precipitation process for the present system has been modeled as a ternary mass transfer problem. The calculated diffusion trajectories and concentration profiles illustrate reasonably the membrane morphologies formed in various immersion conditions.
關聯:	Journal of membrane science 145(1), pp.77-90
DOI:	10.1016/S0376-7388(98)00063-5
顯示於類別:	[化學工程與材料工程學系暨研究所] 期刊論文

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