Abstract
A series of triblock copolymers composed of poly(ethylene glycol) (PEG) and poly(β-amino ester urethane) (PAEU) was synthesized and characterized. Its aqueous solution can be used as a non-cytotoxic, biodegradable, and pH/temperature-sensitive hydrogel system. The copolymer solutions exhibited sol-to-gel and gel-to-sol transitions with increasing pH and temperature, respectively. The properties of this hydrogel system, such as its sol–gel transition diagram, mechanical properties, and degradation rate, can be controlled by modulating the PEG molecular weight, PAEU block length, copolymer concentration, or structure of the monomers. The presence of urethane groups and ionized tertiary amine groups in the copolymer solution at lightly acidic pH may lead to a strong interaction of the copolymer with formulated bioactive therapeutic agents, while the existence of the gel state under physiological conditions (37 °C, pH 7.4) may enable this copolymer hydrogel to be applicable as a drug/protein carrier.
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Acknowledgments
This study was supported by the Basic Science Research Program through a National Research Foundation of Korea grant funded by the Korean Government (MEST) (2010-0027955) and the Converging Research Center Program funded by the Ministry of Education, Science and Technology (2011K000817).
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Huynh, C.T., Lee, D.S. Controlling the properties of poly(amino ester urethane)–poly(ethylene glycol)–poly(amino ester urethane) triblock copolymer pH/temperature-sensitive hydrogel. Colloid Polym Sci 290, 1077–1086 (2012). https://doi.org/10.1007/s00396-012-2624-z
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DOI: https://doi.org/10.1007/s00396-012-2624-z