CAJ | 학술논문

以80％的L－乳酸为原料，辛酸亚锡为催化剂，丙交酯开环聚合得到了粘均分子量为5.1×105的聚乳酸。考察了脱水时间、反应温度、催化剂用量对丙交酯合成的影响，得到了合成丙交酯的最佳工艺条件，其收率最高达到76.7％；研究了合成高分子量聚乳酸的最佳工艺条件。红外光谱表征并对比分析了合成的丙交酯和聚乳酸。用DSC－TG分析了不同提纯次数的丙交酯的纯度，表明提纯三次后的丙交酯纯度较高，同时也分析了在不同温度下合成的聚乳酸，表明在130℃下合成的聚乳酸热稳定性好。
이80％적L－유산위원료，신산아석위최화제，병교지개배취합득도료점균분자량위5.1×105적취유산。고찰료탈수시간、반응온도、최화제용량대병교지합성적영향，득도료합성병교지적최가공예조건，기수솔최고체도76.7％；연구료합성고분자량취유산적최가공예조건。홍외광보표정병대비분석료합성적병교지화취유산。용DSC－TG분석료불동제순차수적병교지적순도，표명제순삼차후적병교지순도교고，동시야분석료재불동온도하합성적취유산，표명재130℃하합성적취유산열은정성호。
Using 80% L-lactic acid as raw materials , stannous caprylate as the catalyst , sticky molecular weight 5.1×105 of poly lactic acid (PLA) was synthesized by the lactide ring-opening polymerization.The influence factors of lactide synthesis such as reaction time , temperature and catalyst dosage were studied , obtained the optimum technological conditions for synthesis of lactide , its yield was up to 76.7%.Aynthetic optimum process conditions for the synthesis of high molecular weight poly lactic acid , fourier transforms infrared spectrum characterization and analysis of the synthesis of lactide and poly lactic acid were researched.Analyzed by DSC and TG in different times for the purification of the purity of lactide , the results showed that the purity was higher after the three times for the purification of lactide.Synthesis of poly lactic acid under the different synthesis temperature was analyzed too.It was suggested that heat stability of synthetic poly lactic acid was good in 130 ℃.