We present the synthesis of a thermo- andpH-sensitive hydrophilic ABAlinear triblock copolymer, poly(methoxydi(ethylene glycol) methacrylate-co-methacrylic acid)-b-PEO-b-poly(methoxydi(ethylene glycol) methacrylate-co-methacrylic acid), and the study of sol-gel transitions of itsaqueous solutions at various pH values. Rheological measurements showed that thesol-gel transition temperature of 12.0 wt % aqueous solution of this triblockcopolymer can be tuned over a wide temperature range by adjusting the solutionpH. Multiple sol-gel/gel-sol transitions were realized by judiciouslycontrolling the temperature and pH simultaneously, demonstrating thepossibility of achieving on-demand sol-gel transitions by using two externalstimuli.

Thermo- and pH-sensitive aqueous micellar gels from a doubly responsive hydrophilic ABA linear triblock copolymer

242nd National Meeting (2011)

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