Abstract—

Using one-step high-temperature polycyclocondensation organosoluble homo- and copolyimides containing various side groups, such as CF₃‒, СOOН‒, Cl‒, and fluorene, and their certain combinations, are synthesized, and their effect on O₂, N₂, CO₂, He, and CH₄ permeability coefficients of films is studied. The synthesized polymers with a inherent viscosity of 0.41–0.76 dL/g are characterized by a high heat resistance (230°C ≤ Т_g ≤ 380°C) and form strong films (60 MPa ≤ σ ≤ 140 MPa; 0.9 GPa ≤ E ≤ 1.6 GPa). It is shown that depending on the nature of side groups the polyimides under consideration demonstrate different gas-transport behavior. For example, for one of the polymers the selectivity factor for He/CH₄ separation is 315 (a He permeability coefficient of 9.5 Barrer), while for another polymer the selectivity factor for CO₂/CH₄ separation is 34 (at a CO₂ permeability coefficient of 37.3 Barrer). For crosslinked polyimide films the selectivity factor for He/CH₄ separation attains 125 (at a He permeability coefficient of 19.7 Barrer) and the selectivity factor for CO₂/CH₄ separation is 43 (at a CO₂ permeability coefficient of 7.0 Barrer).

中文翻译：

---

各种侧基聚酰亚胺的输气性能

摘要-

使用一步式高温缩聚反应，可合成含有各种侧基（例如CF ₃ ‒，СOOН‒，Cl‒和芴）及其某些组合的有机均聚物和共聚酰亚胺，及其对O ₂，N _2的影响研究了薄膜的CO ₂，He和CH _4的渗透系数。用的一个0.41-0.76固有粘度合成的聚合物分升/克的特征在于高的耐热性（230℃≤查阅商品说明Т_克≤380℃），并形成较强的膜（60兆帕≤σ≤140兆帕; 0.9 GPA≤ ë ≤1.6 GPa）。结果表明，根据侧基的性质，所考虑的聚酰亚胺表现出不同的气体传输行为。例如，对于其中一种聚合物，He / CH ₄分离的选择性因子为315（He渗透系数为9.5 Barrer），而对于另一种聚合物，CO ₂ / CH ₄分离的选择性因子为34（在CO _2下渗透系数为37.3 Barrer）。对于交联的聚酰亚胺薄膜，He / CH ₄分离的选择性因子达到125（He渗透系数为19.7 Barrer），CO ₂ / CH ₄分离的选择性因子为43（CO _2时）。 渗透系数为7.0 Barrer）。