TDI扩链端羟基聚乳酸的研究  

Study on the Synthesis of Hydroxy-Terminated Polylactic Acid Chain Extended by 2,4-Toluylene Diisocyanate

作　　者：张昭[1] 陈春兰[1] 樊国栋[1] 

机构地区：[1]教育部轻化工助剂化学与技术重点实验室陕西科技大学化学与化工学院,西安710021

出　　处：《聚氨酯工业》2010年第6期21-23,31,共4页Polyurethane Industry

基　　金：陕西省科技攻关项目(2008K07-32);陕西省教育厅专项科研计划项目(08JK228)

摘　　要：以1,4-丁二醇和乳酸在辛酸亚锡催化下,进行熔融缩聚反应,形成端羟基聚乳酸,再以2,4-甲苯二异氰酸酯(TDI)进行扩链反应,合成可溶性聚酯型聚氨酯共聚物。用粘均相对分子质量、红外光谱、XRD对产物进行表征。结果表明,在nNCO∶nOH=1.0∶1.0、170℃和0.096 MPa条件下反应30 min,可得到粘均相对分子质量为13.2万的扩链产物,为扩链前端羟基聚乳酸的6.3倍;XRD测试表明,扩链使结晶度由扩链前27.95%下降到扩链后6.94%。The hydroxy-terminated polylactic acid（HO-PDLLA-OH） was prepared with D,L-lactic acid and 1,4-butylene glycol through condensational polymerization catalyzed by stannous octoate.Using HO-PDLLA-OH as prepolymer,2,4-toluylene diisocyanate（TDI） as chain extender,the soluble poly（ester urethane） copolymer was synthesized in melt state.The product was characterized by viscosity-average molecular weight（Mη）,IR,XRD.The results showed that interpolymer was synsthesized as follows,nOH∶nNCO was 1.0∶1.0,reacting for 30 min at 170℃ under pressure of 0.096 MPa.The Mη of chain extension product was 132 thousand and was 6.3 times higher than the hydroxy-terminated polylactic acid.XRD test showed that crystallinity dropped from 27.95% to 6.94%.

关 键 词：2 4-甲苯二异氰酸酯 端羟基聚乳酸 1 4-丁二醇 扩链 生物降解材料 

分 类 号：TQ320.7[化学工程—合成树脂塑料工业]