纺织学报 ›› 2012, Vol. 33 ›› Issue (3): 14-17.

• 纤维材料 • 上一篇    下一篇

乙二醇改性聚乳酸的直接熔融聚合法合成及表征

陈佑宁,张知侠   

  1.  咸阳师范学院化学与化工学院
  • 收稿日期:2011-03-07 修回日期:2011-11-19 出版日期:2012-03-15 发布日期:2012-03-06
  • 通讯作者: 陈佑宁 E-mail:chenyn@xync.edu.cn
  • 基金资助:

    省级

Direct Melt Polycondensation and Characterization of Polylactic

 CHEN  You-Ning, ZHANG  Zhi-Xia   

  • Received:2011-03-07 Revised:2011-11-19 Online:2012-03-15 Published:2012-03-06
  • Contact: CHEN You-Ning, E-mail:chenyn@xync.edu.cn

摘要: 以乳酸(LA)、乙二醇(EG)为原料,采用熔融聚合法直接合成了乙二醇改性聚乳酸,并用特性粘数、FT-IR、DSC等手段进行表征,探讨了催化剂种类和用量、熔融聚合反应时间、反应温度以及不同投料比对聚合物合成的影响。在单体投料摩尔比n(EG)∶n(LA)=3∶100、170℃、0.095MPa、催化剂Sn(Otc)2用量0.5(wt)%、熔融聚合8h条件下,聚合物粘均相对分子质量( )可达16374,降解性能得到改善,并保持着较好的亲水性能。随着投料比中EG的增加,产物特性粘数逐步降低,玻璃化温度(Tg)有降低的趋势。

Abstract: Polylactic acid modified by ethylene glycol was synthesized via melt polycondensation by using lactic acid (LA)and ethylene glycol (EG) as starting monomer material directly and characterized with intrinsic viscosity, FT-IR and DSC. The influences of different synthetic conditions including kinds and quantity of catalyst, time and temperature of melt copolycondensation, and different molar feed ratio were discussed in detail. Under the conditions of molar feed ratio of EG to LA 3∶100,amount of catalyst Sn(Otc)2 0.5(wt)%, polymerization temperature 170℃ and pressure 0.095MPa, polymerization time 8h the maximum of the as-prepared polymer was 16374, degradation performance of the products were improved, and maintained good water affinity performance. With the increase of the molar feed ratio of EG, its intrinsic viscosity, and glass-transition temperature decreased gradually.

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