Polycarbonate block copolymers

摘要

The disclosure pertains to amphiphilic block copolymers comprising an aliphatic polycarbonate chain coupled to a hydrophilic polymer. Such amphiphilic polymers may have the formula A-L-B, where A- is a polycarbonate or polyethercarbonate chain having from about 3 to about 500 repeating units, L is a linker moiety and -B is a hydrophilic oligomer having from about 4 to about 200 repeating units. Provided copolymers are useful as surfactants capable of emulsifying aqueous solutions and supercritical carbon dioxide. Provided copolymers also have utility as additives for use in enhanced oil recovery methods.

主权项

1. A method for the synthesis of a copolymer comprising reacting an epoxide and carbon dioxide in the presence of a suitable catalyst and a polyether chain transfer agent, wherein the polyether chain transfer agent contains on one terminus a labile group that can be removed after construction of the copolymer to yield a terminal hydroxyl group.