Partially crosslinked poly(diphenylacetylene) (3a) bearing silanol groups were synthesized by the treatment of the membrane of 2a with n-Bu4N+F−. Imidazolium salt-containing poly(diphenylacetylene) (3b (Br−)) was obtained by the substitution of 1-methylimidazole to the membrane of 2b. Sulfonation of 2c gave a sulfonated poly(diphenylacetylene) (3c). The membrane of 3a was found to exhibit high gas permeability irrespective of the presence of the polar silanol groups in the polymer. Introduction of 1-methylimidazole into the membrane remarkably increased the CO2/N2 selectivity (PCO2/PN2=31–44). The sulfonated polymer 3c exhibited high CO2 permselectivity, and the PCO2/PN2 was as large as 54.
- Toshikazu Sakaguchi
- Tamotsu Hashimoto
