Sorption and Gas Transport Characteristics of Polyimides Based on a Mixture of Diethyl Toluene Diamine Isomers

Abstract The transport of oxygen, nitrogen, and hydrocarbons C 1 –C 4 in polyimides based on 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) biphenyl-3,3',4,4'-tetracarboxylic acid dianhydride (BPDA) diethyl toluene diamine (DETDA) has been studied. dependences the diffusion coefficient diffusant effective diameter solubility coefficients Lennard–Jones potential pair interaction have considered. It is shown that butane are out linear dependence logarithm square diffusant, which may indicate plasticization polymers with at a pressure atm. permeability mixtures gases O 2 –N (29 : 71 v/v) CO –CH (62 38 There no significant differences gas separation parameters comparison experiment for individual gases; however, mixture , slight increase factor found as compared to ideal selectivity. data measurement sorption isotherms N CH also presented article. Gas be close values obtained indirectly P / D .