以锌为催化剂由乳酸的低聚物裂解制得单体丙交醋，再由二乙基锌引发开环聚合得到高分子量的聚乳酸。
With the Zinc as the catalyst, lactide monomer was obtained by decomposition of low polymer. With the zinc diethyl as the catalyst, the lactide was polymerized to Poly(DL-lactic acid).
目的：设计并研制聚- DL -乳酸矩形生物降解腰椎间融合器，分析其材料学特性。
OBJECTIVE: to design and fabricate the poly DL-lactic acid biodegradable fusion cage of lumbar vertebrae, and to analyze the material characteristics.
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