Amine-containing polysilsesquioxane (PSQ) membranes were studied with regard to their CO2 separation ability. PSQ membranes were prepared by using amine-containing monomers, bis(triethoxysilylpropyl)amine (BTESPA), (aminopropyl)triethoxysilane (APTES), and (aminoethylaminopropyl)triethoxysilane (AEAPTES). The CO2 permeances of the membranes prepared by 1:1 copolymerization with bis(triethoxysilyl)ethane increased in the order of AEAPTES-derived membranes < APTES-derived membranes < BTESPA-derived membranes, and their CO2/N2 permselectivities decreased in the same order. Copolymerization under acidic conditions resulted in the formation of ammonium-containing membranes with improved CO2 permeances and acceptable CO2/N2 permselectivities.
- Joji Ohshita
- Takatoshi Okonogi
- Toshinori Tsuru
