催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (6): 547-550.

• 研究论文 • 上一篇    下一篇

三(2,6-二叔丁基-4-甲基苯氧基)镧配合物催化合成星形聚己内酯

朱蔚璞,陈伟,沈之荃   

  1. 浙江大学高分子科学研究所教育部高分子合成与功能构造重点实验室, 浙江杭州 310027
  • 收稿日期:2007-06-25 出版日期:2007-06-25 发布日期:2011-05-28

Synthesis of Star Poly(ε-caprolactone) Catalyzed by Lanthanum Tris(2,6-di-tert-butyl-4-methylphenolate)

ZHU Weipu, CHEN Wei, SHEN Zhiquan*   

  1. Institute of Polymer Science, Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of Education, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2007-06-25 Online:2007-06-25 Published:2011-05-28

PDF

800

被引次数

14

摘要： 分别以三乙醇胺和四乙醇乙二胺为引发剂,用三(2,6-二叔丁基-4-甲基苯氧基)镧(La(DBMP)3)作催化剂,催化ε-己内酯开环聚合,制备了三臂和四臂星形聚己内酯. 通过1H NMR表征了聚合物的星形结构以及分子量. 研究表明,每一个催化剂分子可与多个引发剂分子作用,当三乙醇胺与La(DBMP)3的摩尔比值为1.7～6.4时,均可制得纯净的三臂星形聚己内酯. 通过调节ε-己内酯与多元醇的摩尔比值,可以改变星形聚己内酯的分子量,实现聚合产物分子量可控.

关键词: 星形聚己内酯, ε-己内酯, 开环聚合, 镧配合物, 三乙醇胺, 四乙醇乙二胺

Abstract: Tri- and tetra-arm star poly(ε-caprolactone)s have been successfully synthesized by ring-opening polymerization of ε-caprolactone using triethanolamine or N,N,N′,N′-tetrakis-(2-hydroxyethyl) ethylenediamine (HEA) as the multifunctional initiator and lanthanum tris(2,6-di-tert-butyl-4-methylphenolate) (La(DBMP)3) as the catalyst. In1HNMR analysis, compared with triethanolamine and HEA molecules, the chemical shifts of the hydrogen (N(CH2CH2O)n, n=3, 4) in star poly(ε-caprolactone)s moved from 3.65 to 4.10, suggesting the direct linkage between the poly(ε-caprolactone) arm and the initiator. When the molar ratio of triethanolamine to La(DBMP)3 ranged from 1.7 to 6.4, pure tri-arm star poly(ε-caprolactone) could be prepared, which indicates that one catalyst molecule could co-work with several initiator molecules. The molecular weights of star poly(ε-caprolactone) were determined by1HNMR end group analysis, which are very close to the values calculated from the molar ratio of ε-caprolactone to the initiator.

Key words: star poly(ε-caprolactone), ε-caprolactone, ring-opening polymerization, lanthanum complex, triethanolamine, N, N, N′, N′-tetrakis-(2-hydroxyethyl) ethylenediamine