Effect of Film Thickness and Physical Aging on “Intrinsic” Gas Permeation Properties of Microporous Ethanoanthracene-Based Polyimides
作者:Xiaohua Ma、Ingo Pinnau
DOI:10.1021/acs.macromol.7b02556
日期:2018.2.13
Two ethanoanthracene-based dianhydrides, 9,10-dimethylethanoanthracene-2,3,6,7-tetracarboxylic anhydride (EA-DA) and its more flexible dibenzodioxane-containing derivative (EAD-DA), were synthesized from the same starting material, 9,10-dimethyl-ethanoanthracene-2,3,6,7-tetraol, and used for the preparation of bicyclic intrinsically microporous polyimides (PIM-PIs) by one-pot polycondensation reaction
由相同的原料合成了两种基于乙基蒽的二酐9,10-二甲基乙基蒽-2,3,6,7-四羧酸酐(EA-DA)及其更灵活的含二苯并二恶烷的衍生物(EAD-DA)9 1,10-二甲基-乙蒽-2,3,6,7-四醇,用于通过与3,3'-二甲基萘啶(DMN)的一锅缩聚反应制备双环本征微孔聚酰亚胺(PIM-PIs)。所得的有机可溶性聚酰亚胺EA-DMN和EAD-DMN在高达300°C的温度下具有热稳定性,并具有良好的机械性能,拉伸强度分别为55和63 MPa,断裂伸长率分别为15%和30%。EA-DMN和EAD-DMN聚酰亚胺的Brunauer-Emmett-Teller(BET)表面积为720和800 m 2 g –1, 分别。新鲜的薄膜显示出令人鼓舞的气体分离性能,具有很高的气体渗透率和适中的气体对选择性,两者都强烈依赖于薄膜的厚度。在这项研究中获得的结果更加揭示了膜厚度和物理老化对更快获得高自由体积PI