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首页> 外文期刊>Polymer science, Series C >Gas-Transport Properties of Polyimides with Various Side Groups
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Gas-Transport Properties of Polyimides with Various Side Groups

机译：具有各种侧基聚酰亚胺的气体运输性能

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摘要

Using one-step high-temperature polycyclocondensation organosoluble homo- and copolyimides containing various side groups, such as CF3-, COOH-, Cl-, and fluorene, and their certain combinations, are synthesized, and their effect on O-2, N-2, 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 degrees C <= T-g <= 380 degrees C) and form strong films (60 MPa <= sigma <= 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).
机译：采用一步高温多环缩合法合成了含有不同侧基的有机可溶均聚和共聚酰亚胺，如CF3-、COOH-、Cl-和芴及其特定组合，并研究了它们对薄膜O-2、N-2、CO2、He和CH4渗透系数的影响。特性粘度为0.41-0.76 dL/g的合成聚合物具有高耐热性（230摄氏度<=T-g<=380摄氏度）并形成牢固的薄膜（60兆帕<=sigma<=140兆帕；0.9吉帕<=E<=1.6吉帕）。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/CH4分离的选择性因子为315（He渗透系数为9.5巴），而对于另一种聚合物，CO2/CH4分离的选择性因子为34（CO2渗透系数为37.3巴）。对于交联聚酰亚胺薄膜，He/CH4分离的选择性因子达到125（在He渗透系数为19.7巴时），CO2/CH4分离的选择性因子为43（在CO2渗透系数为7.0巴时）。

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