Membrane formation by isothermal precipitation in polyamide-formic acid-water systems I. Description of membrane morphology

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Title:	Membrane formation by isothermal precipitation in polyamide-formic acid-water systems I. Description of membrane morphology
Authors:	Cheng, Liao Ping;Shaw, Horng-Yue
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	membrane;polyamides;Nylon-66;immersion precipitation;microporous membrane
Date:	1995-01
Issue Date:	2013-06-13 11:28:56 (UTC+8)
Publisher:	Hoboken: John Wiley & Sons, Inc.
Abstract:	Aliphatic polyamides (Nylon-66 and a Nylon-6, -66, -610 terpolymer) were isothermally precipitated from formic acid solution by immersing in an aqueous nonsolvent bath or a solvent/nonsolvent mixture. Depending on the composition of the polymer solution and nonsolvent bath, phase separation by nucleation and growth can be initiated for a liquid-liquid phase separation process, a crystallization process or a combined process. Under certain conditions, crystallization of Nylon-66 results in a membrane with a uniform skinless microporous structure that was rapidly wetted by water. In contrast, liquid-liquid phase separation produces a polyamide film with largely unconnected cellular voids that is as a result not wetted by water.
Relation:	Journal of Polymer Science, Part B: Polymer Physics 33(2), pp.211-222
DOI:	10.1002/polb.1995.090330206
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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