SELF-ORGANIZATION OF GRADIENT AND BLOCK COPOLYMERS WITH COMPLEXING PROPERTIES IN SUPERCRITICAL CO_2

摘要

We report the synthesis of new gradient and block fluorinated copolymers, which have complexing properties and are soluble in supercritical carbon dioxide. Poly(1,1,2,2-tetrahydroperfluorodecyl acrylate-co-acetoacetoxyethyl methacrylate) (poly(FDA-co-AAEM)) and poly(1,1,2,2-tetrahydroperfluorodecyl acrylate-co-vinylbenzylphosphonic acid diethylester) (poly(FDA-co-VBPDE) were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization in solvent medium. The cloud points of the copolymers in CO_2 were measured in a variable volume view cell at temperatures between 25～65°C. It was found that the gradient copolymers are soluble in very mild conditions of pressure and temperature. Their self-organization was studied by small-angle neutron scattering (SANS) measurements.