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The combination of topology and CO 2 switchability could provide new options for amphiphilic copolymers. Cyclic molecules supply novel topologies, and CO 2 switching provides stimulus responsiveness. Cyclic poly(2-(diethylamino)ethyl methacrylate)-b-poly(ethylene oxide) and their corresponding block copolymers were prepared from poly(ethylene oxide) and 2-(diethylamino)ethyl methacrylate via atom transfer radical polymerization and Keck allylation with a Hoveyda-Grubbs catalyst. Changes in conductivity, surface activity, and hydrodynamic size were examined to illustrate the switchability of the produced amphiphilic copolymers upon contact with CO 2 in the presence of water. The reversible emulsification and switchable viscosity behaviors of the copolymers were also demonstrated.

Diblock, Triblock and Cyclic Amphiphilic Copolymers with CO2 Switchability: Effects of Topology