高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (11): 2095.

• 论文 • 上一篇    下一篇

ε-己内酯在引发剂La(OAr)3作用下的开环聚合特征──用正交试验法探讨最优聚合条件

谈国华, 凌君, 沈之荃   

  1. 浙江大学高分子科学与工程系, 杭州 310027
  • 收稿日期:2002-11-07 出版日期:2003-11-24 发布日期:2003-11-24
  • 通讯作者: 沈之荃(1931年出生),女,教授,博士生导师,中国科学院院士,主要从事高分子化学研究.E-mail:zqshen@163.net E-mail:zqshen@163.net
  • 基金资助:

    国家自然科学基金(批准号:20174033;20254001);国家“九七三”项目(批准号:G1999064801)资助

Features of Ring-opening Polymerization of ε-Caprolactone Initiated by La(OAr)3──Optimal Conditions Explored by Orthogonal Experimental Design

TAN Guo-Hua, LING Jun, SHEN Zhi-Quan   

  1. Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2002-11-07 Online:2003-11-24 Published:2003-11-24

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摘要： 用三(2,6-二叔丁基-4-甲基苯氧基)镧[La(OAr)3]引发ε-己内酯(CL)的开环聚合.用正交试验方法探索了ε-己内酯在该引发剂下开环聚合的最优条件.两组正交实验结果表明,最佳转化率的反应条件分别为t=20℃,t=50min,c(CL)=0.6mol/L,n(CL)/n(La)=1000和t=30℃,t=30min,c(CL)=0.7mol/L,n(CL)/n(La)=1000.DSC分析结果表明,聚合物的结晶度为50%以上.

关键词: &epsilon, -己内酯, 稀土催化剂, 正交试验方法, 开环聚合

Abstract: The ring-opening polymerization of ε-caprolactone(CL) with lanthanum tris(2,6-di-tert-butyl-4-methylphenolate)[La(OAr)3] as the initiator was reported in this work.Orthogonal experimental design was used to find the optimal conditions of the polymerization.The optimal conditions of the two orthogonal experimental designs were found to be: t=20 ℃, t=50 min, c(CL)=0.6 mol/L, n(CL)∶n(La)={1000} and t=30 ℃, t=30 min, c(CL)=0.7 mol/L, n(CL)∶n(La)=1000, respectively.The crystallinity of PCLwas above 50% measured by means of DSC, the melt temperature increased with the increase of the molecular weight, while the melt enthalpy(ΔHm) and crystallinity decreased with the increase of the molecular weight.

Key words: ε-Caprolactone, Rare earth catalyst, Orthogonal experimental design, Ring-opening polymerization

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