分子结构对6FDA型聚酰亚胺透气性能的影响  

STRUCTURE-PERMEABILITY RELATIONSHIPS OF 6FDA-BASED POLYIMIDE MEMBRANES

作　　者：李悦生[1] 丁孟贤[1] 徐纪平[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《应用化学》1993年第2期81-83,共3页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金

摘　　要：理想的气体分离膜材料应该同时具有高的透气性和良好的透气选择性、高强度、耐高温、耐化学介质和良好的成膜加工性能,聚酰亚胺是一类具有各种优良性能的气体分离膜材料,其中尤以6FDA型聚酰亚胺最引人注目,这类聚酰亚胺在保持普通聚酰亚胺高性能的基础上,改善了加工性能,它们可溶于极性非质子溶剂,可采用相转换法制成不对称膜。本文报道这类聚酰亚胺的分子结构与气体分离性能的关系。The permeability coefficients of five 6FDA-based polyimide membranes to H_2, CO_2, O_2,N_2, and CH_4 have been meassured at 0.6MPa and 30℃. Differences in chemical structure were found to lead to a significant change in permeability coefficients and were related to the ideal separation factotes of smaller penetrant molecules against biger ones. For polyimides 6FDA-DABP, 6FDA-ODA, 6FDA-MDA and 6FDA-IPDA, the increase in permeability coefficents was accompanied with the decrease of the ideal separation factors. Having the bulky methyl side groups on the aromatic rings of DMMDA, polyimide 6FDA-DMMDA possesses both high P_H_2 and high a_H_2/N_2 and a_H_2/CH_4. The favorable permseleetivity, excellent thermal and mechanical durability, and good processability make 6FDADMMDA a promising candidate material for gas separation.

关 键 词：聚酰亚胺 分子结构 气体分离膜 

分 类 号：TQ028.8[化学工程]