Effect of CO2 treated polycarbonate membranes on gas transport and sorption properties

Abstract

The effect of polycarbonate (PC) membranes treated with super critical carbon dioxide on gas sorption and transport properties was studied. It was found that the gas permeability of PC membranes hardly changed after the CO 2 treatment. However, the gas sorption and diffusion properties showed a significant change. The transport properties were determined by measuring the sorption and permeation properties. The oxygen and nitrogen sorption measurements were carried out at 35 • C over the pressure range of 1-25 atm. It was found that exposed CO 2 treatment hardly changed the gas permeability but slightly increased the selectivity of oxygen to nitrogen. This study also showed that the increase in gas solubility was contributed by increasing Langmuir-type sorption of CO 2 treated membranes rather than Henry-type sorption. The change in polymer packing of membrane was evidenced by glass transition temperature measurements. This study showed that the free volume of membranes increased with the increase of exposed CO 2 density.

Effects of MgO Particle Loading on Gas Permeation Properties of Epoxidized Natural Rubber (ENR) / Polyvinyl Chloride (PVC) Membrane

“…The studied polymers include polyisoprene and thermoplastic polymers such as polycarbonate, polystyrene and polyvinylchloride (Chen et al 2000;Dobre et al 2011;Nagasaki et al 1996;Rajabi et al 2013). Johnson and Thomas (1999) stated that the membrane for gas separation process needs to meet several criteria which are high permeability to the desired gas, high selectivity and resistance to processing conditions.…”