Synthesis and thermoresponsive behaviors of thermo-, pH-, CO2-, and oxidation-responsive linear and cyclic graft copolymers
作者：Hongcan Zhang, Wentao Wu, Xiaoqi Zhao, Youliang Zhao*
關(guān)鍵字：cyclic graft polymer, thermoresponse
論文來源：期刊
具體來源：Macromolecules, 2017, 50, 3411-3423
發(fā)表時間：2017年
Rational macromolecular design allows us to construct multiresponsive architectural polymers with a potential toward multipurpose applications. This study aims at synthesis and LCST-type thermoresponsive behaviors of multisensitive linear and cyclic graft copolymers with polyacrylamide backbone and hydrophilic PEG grafts. The cloud point could be tuned by many factors, and the e?ect of cyclization was con?rmed by the elevated cloud point in H2O up to 12.8 °C under same conditions. The PEG-connecting Y junctions with dual amide, thioether, and tertiary amine groups allowed thermo-, solvent-, pH-, and CO2-switchable inter/intramolecular hydrogen bonding interactions and hence resulted in unusual solvent (H2O or D2O) and pH (about 6.8?8.5) dependent phase transition and irreversible CO2-responsive behavior. Meanwhile, the solution blending could lead to one or two phase transition(s) dependent on types and compositions of the blends. The meticulous introduction of multifunctional Y junctions into graft copolymers o?ers a versatile route to adjust multitunable thermoresponsive properties.