BARRER reaction time

Polyimide containing poly(ethylene oxide) is a simple and convenient way to improve the gas separation properties. The copolymers are synthesized by the reaction of dianhydride and diamines with/without amine-terminated poly(ethylene oxide). Maya el al. and Munoz et al. reported thermal treatment effect of PEO-Z)-PI copolymer on the gas permeation properties. Phase segregation of the polymer chain at higher treatment temperature to 300 °C contributed to improvement of gas permeability of the membrane. Molecular weight of poly(ethylene oxide) of 6000 was appropriate to induce microphase separation. CO2 permeability was reached from 2.3 to 24 Barrer according to the PEO composition before thermal treatment, while it was enhanced by three to ten times higher permeability after thermal treatment at 300 °C without serious reduction in permselectivity. 

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