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Weipu Zhu, Alper Nese and Krzysztof Matyjaszewski Thermoresponsive star triblock copolymers by combination of ROP and ATRP: From micelles to hydrogels Journal of Polymer Science Part A: Polymer Chemistry 49

Version of Record online: 1 MAR 2011 | DOI: 10.1002/pola.24611

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Well-defined four-arm star triblock copolymers (PCL-b-POEOMA475-b-PMEO2MA)4 and (PCL-b-PMEO2MA-b-POEOMA475)4 were successfully synthesized by the combination of ring-opening polymerization and atom transfer radical polymerization ROP and ATRP. The thermal responses of the two series of copolymers are quite different and depend on the sequence distribution of each block along the arms of the star. The (PCL-b-POEOMA475-b-PMEO2MA)4 star triblock copolymer, with the thermoresponsive PMEO2MA segment on the periphery, can undergo reversible sol-gel transitions between room temperature (22 °C) and human body temperature (37 °C).

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