Abstract
This paper describes a new class of smart microgels that possess entirely reversible thermally induced swellability and acid-liable dynamic properties in aqueous solution. To this end, 3-(4-formylphenoxy)-2-hydroxypropyl methacrylate (FPHPMA) was synthesized. RAFT polymerization of FPHPMA, RAFT random copolymerization of FPHPMA and poly(ethylene glycol) methacrylate (PEGMA), and chain extension RAFT polymerization of PEGMA using P(FPHPMA-ran-PEGMA) as a macromolecular chain transfer agent proceeded under visible light radiation at 25 °C. The results indicated the well-controlled polymerization of FPHPMA, comparable reactivity of FPHPMA and PEGMA, and living character of these polymerizations under such mild conditions. Thus, a range of well-defined copolymers of FPHPMA and PEGMA with different chain length, composition, or sequence were synthesized. The aldehyde groups of copolymers were stable against air oxidation in aqueous solution at 80 °C. These copolymers well dissolved in water at low solution tem...
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