Effect of Viscosity of Coagulant on Asymmetric Polyimide (PMDA-4, 4-ODA) Membrane Preparation

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概要

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• Asymmetric polyimide membranes were prepared using various coagulants such as diethylether, <I>n</I>-hexane, acetone, toluene, methanol, o-xylene, ethanol, 1, 4-dioxane, water and ethylene glycol. It was found that coagulants having viscosities lower than 0.8 mPa·s give good shaped membranes and that the as-cast film does not coagulate or is broken during immersion into coagulants having higher viscosities than 1.2 mPa·s. The as-cast film immersed in ethanol with a viscosity of 1.0, is broken during hand treatment. Coagulants of lower viscosity might penetrate more quickly into the as-cast film, causing it to solidify but still allowing enough time to form an interlocked porous structure. SEM observation showed that a closed-pore structure is formed at low temperature, versus open-pore at high temperature, using the same successful coagulant such as hexane and toluene. The effective thickness calculated based on measured permeabilities increases in the sequence of N<SUB>2</SUB>, CO<SUB>2</SUB>, and liquid and vapor EtOH, i. e., 2.7, 3.9, 6.0, and 6.0 μm, respectively, for membranes coagulated in toluene at 293 K.

• 日本膜学会の論文

著者

• Semenova S.I.

  On leave from NPO “Polimersintez”

• Higashijima T.

  Department of Material Science and Chemical Engineering, Yokohama National University

• Negishi Y.

  Department of Material Science and Chemical Engineering, Yokohama National University

関連論文

• Effect of Viscosity of Coagulant on Asymmetric Polyimide (PMDA-4, 4-ODA) Membrane Preparation
• Gas Permeation Characteristics of Zirconia-Silica Composite Membranes at High Temperature.

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