直接缩聚法合成聚乳酸的工艺改进  

Improvement on Direct Polycondensation of Polylactic Acid

作　　者：郑敦胜[1] 郭锡坤[1] 贺璇[1] 张耀[1] 

机构地区：[1]汕头大学化学系,广东汕头515063

出　　处：《塑料工业》2004年第12期8-10,共3页China Plastics Industry

基　　金：汕头大学科学研究基金项目 ( 90 1-10 60 82 )

摘　　要：以D ,L 乳酸为原料 ,采用优选催化剂、分步除水、连续通氮气、高真空缩合等工艺 ,直接缩聚合成了可完全生物降解的材料聚乳酸 (PLA)。研究了催化剂的种类和用量、聚合温度、聚合时间、体系真空度、聚合工艺等对聚乳酸摩尔质量的影响。最佳条件为辛酸亚锡催化剂 0 5份 ,聚合温度 175℃ ,聚合时间 12h ,真空度 3 0Pa。改进工艺后合成的聚乳酸无氧化、变色现象 ,产物的粘均摩尔质量 (Mη)达到 2 0 80 0g/mol。The direct polycondensation methods along with the improved process of catalysts, dehydration, nitrogen and vacuum were adopted to synthesize the biodegradable material of polylactic acid (PLA) from D, L-lactic acid. The influence of different catalysts and the amount of catalysts, temperature and time of polymerization, vacuum and polymerization process on the molecular weights of PLA was discussed. The optimum reaction condition was that the contet of stannite caprylate was 0.5 phr,polymerized at 175℃ for 12h,in vacuum of 30 pa.The synthesized PLA had no oxidation and color deterioration, and the viscosity average molecular weight of which was up to 20800 g/mol.

关 键 词：聚乳酸 聚合工艺 摩尔质量 

分 类 号：TQ316.4[化学工程—高聚物工业]