Abstract
The properties of thermo-sensitive polymers can be easily and reversibly switched using addition/removal of carbon dioxide (CO2) as an innovative and ecological trigger. N,N-(diethylamino)ethyl acrylamide (DEAEAM) was copolymerized with N-isopropylacrylamide (NIPAM) by Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization to obtain copolymers with various compositions and architectures. The properties (solubility, aggregation behavior…) of these polymers in aqueous solution in the presence of CO2 was studied via scattering, microscopy and turbidimetry measurements. The copolymerization of DEAEAM monomer with NIPAM enables to produce either statistical or diblock copolymers and to tune the cloud point temperature of obtained copolymers either by changing the composition or the architecture (statistical, block) or by CO2 addition/removal. Whereas, for a given composition, statistical copolymer does not display thermoresponsive behavior, block copolymers present a thermoresponsiveness which depends on the protonation degree of tertiary amine functions. Additionally, CO2 can be used to reversibly modulate the properties of these materials in aqueous media.
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