Precise Synthesis and Applications of Branched Poly(lactic acid)

研究了以可再生资源为原料精确合成超支化聚乳酸S(支化聚酯)及其应用。以乳酸和丙交酯为单体，实现了以蓖麻油为核、聚乳酸为支链的支化聚酯的精确合成。通过改变丙交酯和蓖麻油的投料比，可以控制支化聚酯的相对分子质量和热性能。对支化聚酯进行了端基官能化处理，以适应其应用。聚乳酸和细菌聚酯等生物质塑料只需添加少量的支化聚酯衍生物即可有效地改善其物理性能。

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.