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首页> 外文期刊>Journal of Applied Polymer Science >Structure and gas permeation properties of asymmetric polyimide membranes made by dry-wet phase inversion: Influence of the polyimide molecular weight
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Structure and gas permeation properties of asymmetric polyimide membranes made by dry-wet phase inversion: Influence of the polyimide molecular weight

机译：干湿相转化制得的不对称聚酰亚胺膜的结构和透气性能：聚酰亚胺分子量的影响

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摘要

In this article, we report the influence of the polyimide molecular weight (1.2 × 10_5, 2.6 × 10_5, and 4.1 × 10 _5) on the structure and the gas permeation properties of asymmetric polyimide membranes made by the dry-wet phase-inversion process. The apparent skin layer thickness of the asymmetric membrane increased with increasing molecular weight, and the thicknesses of the membranes prepared from the three polyimides with a casting polymer solution containing 8.0 wt % butanol were 132, 350, and 739 nm, respectively. That is, the gas permeance in the asymmetric membranes increased with decreasing molecular weight. In contrast, the gas selectivity of the asymmetric membranes did not depend on the skin layer thickness. The solvent evaporation in the dry phase-inversion process and the nonsolvent diffusion in the dry process were important factors that determined the formation of the asymmetric membrane.
机译：在本文中，我们报告了聚酰亚胺分子量（1.2×10_5、2.6×10_5和4.1×10 _5）对通过干湿相转化工艺制备的不对称聚酰亚胺膜的结构和气体渗透性能的影响。不对称膜的表观表层厚度随分子量增加而增加，并且由三种聚酰亚胺与包含8.0 wt％丁醇的流延聚合物溶液制备的膜的厚度分别为132、350和739nm。即，不对称膜中的气体渗透率随着分子量的降低而增加。相反，不对称膜的气体选择性不取决于表皮层的厚度。干相转化过程中的溶剂蒸发和干过程中的非溶剂扩散是决定不对称膜形成的重要因素。

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