膜科学与技术

BTDA/6FDA-DAM/2,6DAT嵌段聚酰亚胺膜制备及其气体分离性能研究

作者：郭欣，衣华磊，段翠佳，郝蕴，李恩尚，骆鑫雨

单位： 1中海油研究总院有限责任公司，北京市 100028；2中海油天津化工研究设计院有限公司，天津市，300130；3天津大学，天津市，300071

关键词：嵌段聚酰亚胺；天然气；气体分离膜

出版年,卷(期):页码： 2022,42(1):80-87

摘要：

以6FDA、BTDA、DAM和2,6DAT为单体，合成不同嵌段结构或嵌段长度的聚酰亚胺，通过FT-IR、XRD、DSC、万能试验机和气体渗透仪研究不同嵌段聚酰亚胺膜的化学结构、链段堆积结构、热性能、机械强度和气体分离性能。DSC结果显示，嵌段聚酰亚胺玻璃化转变温度略低于无规共聚聚酰亚胺。气体渗透测试结果显示，不同嵌段结构聚酰亚胺(BTDA-DAM)/(6FDA-2,6DAT)-x和(BTDA-2,6DAT)/(6FDA-DAM)-x的气体渗透系数随嵌段长度增加呈相反变化趋势。嵌段长度5或10时，嵌段聚酰亚胺膜气体分离性能最优：(BTDA-DAM)/(6FDA-2,6DAT)-5较无规共聚聚酰亚胺膜CO2渗透系数提高了52%，同时CO2/CH4分离系数基本不变甚至略有增加。

Block-polyimide with different block structure or block length was synthesized using 6FDA, BTDA, DAM and 2,6DAT. Chemical structure, chain stacking structure, thermal property, mechanical strength and gas separation performance of block-polyimide were studied by FT-IR, XRD, DSC, mechanical strength testing machine and gas permeator. DSC showed that glass transition temperature of block-polyimide was slightly lower than that of random copolyimide. The gas permeability test results showed that the gas permeability of (BTDA-DAM)/ (6FDA-2,6DAT)-x and (BTDA-2,6DAT)/(6FDA-DAM)-x with different block structure showed an opposite trend with the increase of block length. When block length is 5 or 10, the gas separation performance of block-polyimide membranes is optimal: CO2 permeability of (BTDA-DAM)/(6FDA-2,6DAT)-5 is 52.5% higher than that of random copolymer polyimide membrane, and CO2/CH4 selectivity is almost unchanged.

郭欣（1986-），男，硕士，高工，海洋石油工艺设计

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