Carbon dioxide-based polylactic acid copolymer and preparation method thereof

The invention provides a carbon dioxide-based polylactic acid copolymer and a preparation method thereof.The preparation method comprises the steps that lactic acid and ethyl sulfonyl chloride are subjected to a synthetic reaction, then the synthetic reaction and vinyl alcohol are further subjected to an esterification reaction, and ethyl sulfonyl lactic acid ethylene oxide is obtained through oxidation; and finally, copolymerizing with carbon dioxide under the action of a catalyst to prepare the carbon dioxide-based polylactic acid copolymer. According to the preparation method of the carbon dioxide-based polylactic acid copolymer, the obtained carbon dioxide-based polylactic acid copolymer has good physical and chemical properties, thermal stability and biodegradability. 本发明提供一种二氧化碳基聚乳酸共聚物及其制备方法，先以乳酸与乙基磺酰氯进行合成反应，然后进一步与乙烯醇进行酯化反应，再氧化得到乙基磺酰乳酸环氧乙烷，最后与二氧化碳在催化剂作用下共聚制备得到二氧化碳基聚乳酸共聚物。本发明所述的二氧化碳基聚乳酸共聚物的制备方法，得到的二氧化碳基聚乳酸共聚物，具有良好的物理化学性能、热稳定性、生物降解性能。