Precise Synthesis and Applications of Branched Poly(lactic acid)

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Precise synthesis of hyperbranched poly(lactic acid)s (branched polyesters) from renewable resources and their applications have been examined. For the branched polyesters with the core of castor oil and the branch of poly(lactic acid), their precise synthesis was achieved by using lactic acid and lactide as monomer. The molecular weight and the thermal properties of the branched polyesters were controlled by the feed ratio of lactide and castor oil. Terminal functionalization of the branched polyesters was made for their applications. Physical properties ofbiomass plastics such as poly(lactic acid) and bacterial polyester were efficiently improved by the addition of only a small amount of these branched polyesters derivatives.