微孔PI气体分离膜的研究进展

Progress of Microporous Polyimide Membranes for Gas Separation

自具微孔材料(PIMs)由于自身刚性分子链的扭曲折叠等会产生高比表面积的微孔结构,相应的膜材料具有优异的气体分离性能。将刚性扭曲的结构单元引入到聚酰亚胺(PI)主链中就得到自具微孔PI。微孔型PI是近年来发展的一种新型PI,其微孔结构使得PI膜的气体分离性能得到很大提升,其中气体渗透系数的提升尤为显著,且保持了传统PI良好的热稳定性、化学稳定性及高力学强度等性质。本文重点介绍了微孔PI以及基于微孔PI复合膜的最新研究进展,并对其未来发展趋势进行了展望。

Polymers of intrinsic microporosity （PIMs） attract more and more attention in gas separation membranes with superior gas separation properties due to their highly developed intrinsically microporous structure which forms as a direct consequence of the highly contorted and rigid macromolecular chains. Microporous polyimide is a new type of polyimide developed in recent years by introducing highly contorted and rigid monomer unit into polyimide backbone. The microporous polyimide exhibits excellent gas separation performance, especially the great improvement of gas permeability due to the microporous structure. Moreover, microporous polyimides could maintain the good properties of conventional polyimides, such as high thermal stability, good chemical stability and high mechanical strength. Herein, the recent progress of microporous polyimide membranes and microporous polyimide-based hybrid membranes for gas separation is discussed. Finally,the perspective is put forward for the future research.