乙二醇改性聚乳酸的直接熔融聚合法合成及表征  

Direct melt polymerization and characterization of polylactic acid modified by ethylene glycol

作　　者：陈佑宁[1] 张知侠[1] 

机构地区：[1]咸阳师范学院化学与化工学院,陕西咸阳712000

出　　处：《纺织学报》2012年第3期14-17,共4页Journal of Textile Research

基　　金：陕西省自然科学基金资助项目(11JK0586);咸阳师范学院专项科研基金资助项目(06XSYK105)

摘　　要：为了改善聚乳酸材料的降解性能和亲水性能,本文采用直接熔融聚合法利用乙二醇对聚乳酸进行了改性,探讨了催化剂种类和用量、熔融聚合反应时间、反应温度以及投料比对聚合物合成的影响,用特性黏数、FT-IR、DSC等手段对产物进行了表征。结果表明:在单体投料物质的量比n(LA)∶n(EG)为100∶3、催化剂Sn(Otc)2用量为0.5%,温度为170℃、压力为0.095 MPa,熔融聚合8 h的条件下聚合物黏均相对分子质量(Mη)可达16 374,降解性能得到改善,并保持较好的亲水性能。随着投料比中EG的增加,产物特性黏数逐步降低,玻璃化温度(Tg)有降低的趋势。Direct melt polymerization is applied to modify polylactic acid with ethylene glycol with a view to improving its degradability and hydrophillicity.The influences of type and quantity of catalyst,time and temperature of melt polymerization reaction,and feed ratio on the synthesis of the polymer were discussed.The resultant product was characterized with intrinsic viscosity,FT-IR and DSC.The results were as follow： when the mole ratio of LA/EG of 100∶3,and Sn（Otc）2 as catalyst with usage amount of 0.5 wt%,reacting at 170 ℃ and 0.095 MPa for 8 h,the maximum Mη of the product reached 16 374,with degradability and hydrophillicity improved.Increasing the dosage of EG decreased the intrinsic viscosity and glass-transition temperature（Tg） of the product gradually.

关 键 词：乙二醇 乳酸 聚乳酸 直接熔融缩聚 

分 类 号：TQ314.2[化学工程—高聚物工业]