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

Journal of Polymer Science, Part B: Polymer Physics - Tập 33 Số 2 - Trang 211-222 - 1995
Liao‐Ping Cheng1, An‐Hwa Dwan2, Carl C. Gryte2
1Department of Chemical Engineering, Tamkang University, Taipei, Taiwan, Republic of China
2Department of Chemical Engineering, Material Science, and Mining Engineering, Columbia University, New York, New York 10027

Tóm tắt

AbstractAliphatic 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. © 1995 John Wiley & Sons, Inc.

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