Synthesis and Oxygen Permeation of Novel Alternating Copolymers Containing Disiloxane and Imido Groups by Hydrosilylation Polyaddition

Polysiloxanes have high oxygen permeability coefficient (\(P_{\text{O}_{2}}\)) and low oxygen separation factor (α = \(P_{\text{O}_{2}}\)/\(P_{\text{N}_{2}}\)) and polyimides high α and low \(P_{\text{O}_{2}}\). To obtain polymers with high α and \(P_{\text{O}_{2}}\), novel alternating copolymers containing disiloxane and imido groups were synthesized by hydrosilylation polyaddition. In spite of low molecular weights, no groups making hydrogen bonds, and relatively high content of siloxane moieties of the resulting polymers, they showed good membrane forming ability and good performances above the Robeson upper bound. To obtain polymers with high oxygen permeability and selectivity, novel alternating copolymers containing disiloxane and imido groups were synthesized by hydrosilylation polyaddition. In spite of low molecular weights, no groups making hydrogen bonds, and relatively high content of siloxane moieties of the resulting polymers, they showed good membrane forming ability and good performances above the Robeson upper bound.