温度和压力对六氟二酐型聚酰亚胺的透气性能的影响

EFFECT OF TEMPERATURE AND PRESSURE ON PERMEABILITY AND PERMSELECTIVITY OF 6FDA-BASED POLYIMIDE MEMBRANES

本文研究了温度和压力对五种六氟二酐（６ＦＤＡ）型聚酰亚胺膜对Ｈ_２、ＣＯ_２、Ｏ_２、Ｎ_２和ＣＨ_４五种气体透过性能的影响．在３０－１００℃区间，五种聚酰亚胺的透气系数与温度的关系均符合Ａｒｒｈｅｎｉｕｓ关系式；在０．３－１．２ＭＰａ区间，压力对透气系数的影响很小．６ＦＤＡ－４，４＇－二氨基二苯酮（ＤＡＢＰ）和６ＦＤＡ－３，３＇－二甲基二苯甲烷二胺（ＤＭＭＤＡ）在１００℃仍然具有较大的透气选择系数，是比较好的气体分离膜材料．

The permeability coefficients of five different 2, 2 - bis (3, 4 -dicarboxyphenyl) hexafluoropropane dianhydride (6FDA)-based polyimide membranes to H_2, CO_2, O_2, N_2 and CH_4 have been measured at 0. 6MPa and at the temperatures from ambient up to 100 ℃. The temperature and pressure dependency of permeability coefficients of 6FDA-based polyimides is smaller than other standard glassy polymers having more flexible backones. 6FDA-DABP and 6FDA-DMMDA have still higher permeability coefficients at 100 ℃. The favorable gas separation property, excellent thermal and mechanical durability, and good processability make 6FDA-DABP and 6FDA-DMMDA to be promisng candidate for membrane-based gas separation application .