几种共聚醚酰亚胺的H_2／N_2分离性能

H_2/N_2 Separation Property of a Series of HQDEA-based Copolyetherimides

合成了一系列双醚二酐（ＨＯＤＥＡ）型共聚醚酰亚胺，研究了它们的Ｈ＿２／Ｎ＿２分离性能。刚性二胺单体的引入可明显降低聚醚酰亚胺的链段活动性，改善Ｈ＿２／Ｎ＿２分离性能。３０℃时，ＨＱＤＥＡ－ＭＤＡ／ＤＡＢ（８０／２０）和ＨＱＤＥＡ－ＭＤＡ／ＴＤＡ（８０／２０）的透Ｈ＿２系数分别比均聚物ＨＱＤＥＡ－ＭＤＡ高２４％和１５％，Ｈ＿２／Ｎ＿２分离系数分别比ＨＱＤＥＡ－ＭＤＡ高９％和３０％。

A Setics of HQDEA-basedcopolyethermides were prepared from six diamines(e. g. MDA,p-PDA,m-PDA,1.5-NDA,TDA,and DAB).H_2 permeability coefficient and H_2/N_2seletivity coefficient of six polyetherimides weremeasured at the temperatures from ambient up to150℃ under 7atm; Repalcement partly of MDA withrigid diamines generally increased H_2/N_2 selectivity. Among five copolyetheTimides,HQDEA-MDA/TDA(80/20 ) had the highest H_2 permeability and higherH_2/N_2 selectivity, while HQDEA-MDA/DAB(80/20)had higher H_2 permeability and the highest H_2/N_2selectivitv, H_2 permeability coefficient and H_2/N_2selectivity coefficient of HQDEA-MDA/TDA(80/20)were increased by 24%and 9%at 30℃,respectively,compared with HQDEA-MDA, while H_2 permeabilitycoefficient and H_2/N_2 selectivity coefficient ofHQDEA-MDA/DAB(80/20) were increased by 15%and 30%at 30℃,respectively,compared withHQDEA-MDA.