CO2 sorption and transport in copoly(ether-imide)s having poly(propylene oxide) segments at different temperatures and pressures

In this work, the synthesis of block copolyimides, having an analogous composition, derived from the reaction of an aromatic dianhydride (BPDA) with a mixture of both an aromatic diamine (ODA) and an aliphatic diamine with poly(propylene-oxyde)s moieties (PPO-4000) has been carried out.In particular the mass fraction of PPO can be varied from 17% up to 67%, obtaining a wide range of physical as well as permselectivity properties. CO2 solubility measurements were performed on different block copolymers, in isothermal conditions in a pressure decay equipment which works up to 20 bar. The effect of PPO content, as well as temperature of thermal treatment experienced by the samples prior to characterization, on the CO2 solubility at different temperatures (from 25 to 65°C) and pressures (up to 20 bar) has been investigated.