氨基酸衍生物介入的支化聚乳酸的合成研究

Synthesis of Branched Polylactide Mediated by Aminoacid Derivative

由于线型聚乳酸具有结晶度高、细胞亲和性差、加工成型困难等缺点,因此本研究以N,N-二(2-羟丙基)甘氨酸(BHPG)作为支化单体和催化剂,引发丙交酯发生开环聚合反应,制备出支化聚乳酸。通过乙二醛和二异丙醇胺之间的亲和加成反应制备BHPG,并采用FT-IR、1H NMR表征了兼具支化单体和催化剂的BHPG;然后引发丙交酯开环聚合制备支化聚乳酸,所得聚合物用GPC进行表征;并推测了氨基酸衍生物介入的制备支化聚乳酸的反应机理。

Due to high crystallinity, poor cell affinity and difficult processing, the branched polylactide was successful synthesized by the Ring Opening Polymerization （ROP）of lactide initiated with N,N-Bis-（ 2-hydroxypropyl ）glycine as branched monomer and catalysts in this paper. The nucleophilic addition reaction between oxalaldehyde and diisopropanolamine was performed to prepare BHPG characterized by FT-IR. ^1H NMR. Then, the ROP reaction of lactide was initiated by BHPG to obtain the branched polylactide. The obtained polymers were characterized by GPC. Finally, the mechanism of reaction, which was being mediated with amino derivative, was clarified.