Abstract: The solution crosslinking condensation reaction of α,ω-bis-(dimetylamino) dimethylsiloxane oligomer with hydroxystyrene oligomer was studied. The structure and properties of the crosslinked copolymers obtained were examined by IR, DSC, WAXD, polarizing microscopy, viscosity and GPS(gas permsetectivity) etc..It was found that the crosslinked copolymers which containing certain amount of organosiloxane have two mierophases and low crystallinity showed a better permselectivity for oxygen and nitrogen. Moreover, some hydroxy-groups are remained in the macromolecule backbone of the end copolymers and they may be used for further chemical modification.

Key words: Crosslinked polymer, Oxygen enrichment, Siloxane-hydroxystyrene, copolvmer, Membrane, Condensation