Water-soluble, thermoresponsive, hyperbranched copolymers based on PEG-methacrylates: Synthesis, characterization, and LCST behavior

Mario Luzon, Cyrille Boyer, Carmen Peinado, Teresa Corrales, Michael Raymond Whittaker, Lei Tao, Thomas Paul Davis

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157 Citations (Scopus)


A series of water-soluble thermoresponsive hyperbranched copoly(oligoethylene glycol)s were synthesized by copolymerization of di(ethylene glycol) methacrylate (DEGMA) and oligo(ethyiene glycol) methacrylate (OEG-MA, Mw = 475 g/mol), with ethylene glycol dimethacrylate (EGD-MA) used as the crosslinker, via reversible addition fragmentation chain transfer polymerization. Polymers were characterized by size exclusion chromatography and nuclear magnetic resonance analyses. According to the monomer composition, that is, the ratio of OEG-MA: DEG-MA: EGD-MA, the lower critical solution temperature (LCST) could be tuned from 25 ?C to 90 ?C. The thermoresponsive properties of these hyperbranched copolymers were studied carefully and compared with their linear analogs. It was found that molecular architecture influences thermoresponsive behavior, with a decrease of around 5-10 ?C in the LCST of the hyperbranched polymers compared with the LCST of linear chains.
Original languageEnglish
Pages (from-to)2782 - 2792
Number of pages11
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number13
Publication statusPublished - 2010
Externally publishedYes

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