8Coleman M R,Kohn R,Koros W J,et al.Gas-separation applications of miscible blends of isomeric polyimides[J].J Appl Polym Sci,1993,50:1059-1064.
9Di Landro L,Pegoraro M,Bordogna L,et al. Interactions of polyether-polyurethanes with water vapour and water-methane separation selectivity[J]. J Member Sci,1991,64:229-236.