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合成了一系列双醚二酐型聚醚酰亚胺（ＰＥＩ），研究了它们对Ｈ２、ＣＯ２、Ｏ２、Ｎ２和ＣＨ４五种气体的透过性能与分子结构的关系．结果表明，这类聚醚酰亚胺的分子结构对其透气性和透气选择性有很大的影响，聚合物的自由体积和链段活动性是控制透气性和透气选择性的主要因素。三种带有酰亚胺键邻位取代基的聚醚酰亚胺（ＨＱＤＥＡ—ＤＭｏＢＤＡ、ＨＱＤＥＡ—ＤＭＭＤＡ和ＨＱＤＥＡ—ＤＭｏＭＤＡ）具有较大的自由体积和较小的链段活动性、很高的透气性和透气选择性。
A series of bisether dianhydride polyetherimide (PEI) were synthesized and their relationship with molecular structure of five gases H2, CO2, O2, N2 and CH4 was studied. The results show that the molecular structure of these polyetherimides has a great influence on the gas permeability and air permeability. The free volume and mobility of the polymer are the main factors that control the air permeability and air permeability. Three polyetherimides (HQDEA-DMoBDA, HQDEA-DMMDA and HQDEA-DMoMDA) with ortho-substituent on the imide bond have larger free volume and smaller segment mobility, Sexual and breathable selectivity.