Modified poly(2,6-dimethyl-p-oxyphenylene), a process for its preparation and its use in gas mixture separation membranes

摘要

An amorphous modified poly(2,6-dimethyl-p-oxyphenylene) (PPO) is described with a glass transition temperature (Tg) within the range of 170°-220° C., of which the macromolecules contain units having trialkylsilyl groups bonded to the nucleus and/or to the methyl: ##STR1## together with units having hydroxyethyl groups bonded to the nucleus and/or to the methyl: ##STR2## This modified PPO is prepared by metalating PPO with a metalating agent and reacting the formed metalated PPO with a trialkylsilyl halide and with ehtylene oxide in succession. P PThe use of the thus modified PPO for the preparation of flat, including asymmetric, membranes useful in gas mixture separation processes is described.