Operating temperature effects on the plasticization of polyimide gas separation membranes

摘要: Abstract Membrane plasticization is the process whereby penetrant dissolution causes membrane swelling or dilation, which in turn, can increase diffusivity and solubility lead to long time frame polymer relaxation processes. In this work, effect of temperature upon a rigid polyimide, poly(4,4′-hexafluoroisopropylidene diphthalic anhydride–2,3,5,6-tetramethyl-1,4-phenylenediamine) (6FDA-TMPDA), by carbon dioxide investigated. It found that across full range temperatures studied, has little on as all results be characterized standard dual mode sorption model. However, significant described both an exponential relationship with concentration Arrhenius temperature. The processes induced are also dependent. total proportion associated such relatively unaffected This paper shows effects dominated Henry's law dissolution. Conversely, while species contribute most diffusion at high temperatures, lower movement Langmuir component contributes coefficient.