Membrane formation by isothermal precipitation in polyamide-formic acid-water systems II. Precipitation dynamics

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Title:	Membrane formation by isothermal precipitation in polyamide-formic acid-water systems II. Precipitation dynamics
Authors:	Cheng, Liao Ping;Dwan, An Hwa;Gryte, Carl C.
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	polyamide;Nylon-66;microporous;membrane;ternary;diffusion;precipitation
Date:	1995-01
Issue Date:	2013-06-13 11:28:52 (UTC+8)
Publisher:	Hoboken: John Wiley & Sons, Inc.
Abstract:	An analysis is presented, which describes the isothermal ternary diffusion process encountered in the formation of the aliphatic polyamide membranes such as Nylon-66 by direct immersion-precipitation of a polymeric solution in a nonsolvent bath. A material coordinate is employed to derive the mass transfer equations for the membrane solution. The convective mass transfer in the coagulation bath is taken into account by solving the hydrodynamic boundary layer equations. Diffusion coefficients were measured and used to deduce ternary phenomenological coefficients. The computed results are found to agree with measured precipitation times and with membrane morphologies observed by scanning electron photomicrographs.
Relation:	Journal of Polymer Science, Part B: Polymer Physics 33(2), pp.223-235
DOI:	10.1002/polb.1995.090330207
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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