聚合物
气体分离
单体
高分子化学
渗透
选择性
甲烷
氮气
化学
氧气
体积热力学
侧链
聚酰亚胺
材料科学
膜
有机化学
热力学
催化作用
物理
生物化学
图层(电子)
作者
D. Ayala,Ángel E. Lozano,Javier de Abajo,César A. García-Pérez,José G. de la Campa,Klaus‐Viktor Peinemann,Benny D. Freeman,Rajeev Prabhakar
标识
DOI:10.1016/s0376-7388(02)00602-6
摘要
A series of aromatic polyimides have been investigated for their permeation properties to oxygen, nitrogen, helium, carbon dioxide and methane. The polymers are soluble, film-forming polyimides based on new anhydride monomers containing carbonyl groups as connecting linkages of phenyl rings and bulky side groups like phenyl and t-butyl. To assist in explaining the experimental results, molecular modeling was performed to calculate density, free volume and chain parameters that could account for the behavior of the polymers as selective barriers for gas penetrants. High values of O2/N2 selectivity and good permeabilites were observed for some polymers; their properties lie near the upper bound for this gas pair. Gas permeability typically increased with increasing free volume, and, in general, free volume could be related to the chemical composition of the polymer backbone and to the nature of the pendent groups.
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