PDF全文下载：2011050500
穆蒙， 贺爱华*， 李霞， 黄宝琛
（青岛科技大学 橡塑材料与工程教育部重点实验室，山东 青岛 266042）
摘要： 以辛酸亚锡为催化剂，由L-乳酸合成L-丙交酯（L-LA），考察了裂解温度对丙交酯粗产率及光学纯度的影响。结果表明：随着裂解温度升高，丙交酯收率逐渐升高，但纯化后丙交酯光学纯度逐渐下降，当温度为 205 ℃时，粗产率达72.5%，光学纯度最高，达到99.8%；当温度255 ℃时，粗产率最高达到98.3%，光学纯度为50.9%；通过1H-NMR、FTIR对丙交酯微观结构及其含量进行表征，采用DSC、GC-MS手段对丙交酯熔点和化学纯度进行了测试，另外利用 TG-FTIR进行了丙交酯裂解反应跟踪分析。
关键词： L-丙交酯； 辛酸亚锡； 旋光活性； 裂解
中图分类号: O 643 文献标志码： AStudy on Depolymerization Process in Synthesis of L-lactideMU Meng, HE Ai-hua, LI Xia, HUANG Bao-chen
(Key Laboratory of Rubber-plastics, Ministry of Education, Qingdao University of Science
and Technology, Qingdao 266042,China)Abstract： Effect of the depolymerization temperature on the crude yield and the optical purity of L-lactide(LA) from L-lactic acid was investigated with Sn(Oct)2 as catalyst. The results showed that the increase in the depolymerization temperature might increase the crude yield of L-lactide gradually, whereas, decreased the optical purity. When the depolymerization temperature was 205 ℃，the crude yield reached to 72.5%, while the optical purity increased to 99.8%;when the depolymerization temperature was 255 ℃, the crude yield reached to 98.3%, while the optical purity decrease to 50.9%. The microstructures of LA have been characterized by means of FTIR and 1H-NMR, melting point and purity of LA was tested via DSC and GC-MS methods. In addition, applying TG-FTIR technology, the de-polymerization process was analyzed.
Key words: L-lactide; Sn (Oct)2; optical rotation; decomposition
收稿日期:2011-06-02
作者简介: 穆蒙(1986—),男，硕士研究生.*通信联系人
