POLYMER SYNTHESIS AND THERMALLY REARRANGED POLYMRES AS GAS SEPARATION MEMBRANES
申请人:Freeman Benny D.
公开号:US20120329958A1
公开(公告)日:2012-12-27
The present invention includes a polymer formed by the thermal rearrangement of an ortho-functional polyimide synthesized via chemical imidization with permeation properties for gas separation membranes higher than those synthesized via thermal imidization and a method for forming that polymer having tailored transport properties and different chemical resistance. The present invention also includes a polymer formed by the thermal rearrangement of an ortho-functional polyimide in which a portion of the ortho-position functional group is lost during thermal rearrangement to yield a thermally rearranged polymer with higher permeability than would be seen without the ortho-position group. This ortho-position group can be the result of chemical imidization, or the result of a post-imidization modification reaction.
Burkhardt; Wood, Journal of the Chemical Society, 1929, p. 152