高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (8): 1881.

• 研究论文 • 上一篇    下一篇

原位生成三苄氧基钇催化ε-己内酯可控开环聚合

梁振华, 倪旭峰, 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, 杭州 310027
  • 收稿日期:2010-11-09 修回日期:2010-12-27 出版日期:2011-08-10 发布日期:2011-07-19
  • 通讯作者: 倪旭峰 E-mail:xufengni@zju.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20874083, 20774078)和教育部留学回国人员科研启动基金资助.

Controlled Ring\|opening Polymerization of ε-Caprolactone Initiated by in situ Formed Yttrium Tribenzyloxide Complex

LIANG Zhen-Hua, NI Xu-Feng*, SHEN Zhi-Quan   

  1. Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2010-11-09 Revised:2010-12-27 Online:2011-08-10 Published:2011-07-19
  • Contact: NI Xu-Feng E-mail:xufengni@zju.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20874083, 20774078)和教育部留学回国人员科研启动基金资助.

摘要: 本文研究了以烷基钇[Y(CH2SiMe3)3(THF)2]与苯甲醇原位反应生成的三苄氧基钇为引发剂的ε-己内酯(CL)可控开环聚合。研究结果表明,随着聚合体系中单体/引发剂摩尔比的增大,由1H-NMR计算和GPC测定得到的产物聚己内酯(PCL)的数均分子量均随之线性增加,且分子量分布(Mw/Mn =1.4~1.1)逐渐变窄;1H-NMR计算所得PCL的数均分子量与由单体/引发剂投料比计算得到的理论值一致,表明该体系催化的CL开环聚合具有很好的可控性。1H-NMR分析显示产物PCL的端基分别为苯甲醇酯和醇羟基,由此提出了可能的开环聚合机理。

关键词: 开环聚合, ε-己内酯, 钇配合物

Abstract: Yttrium tribenzyloxide complex in situ formed by the reaction of yittrium trialkyl complex [Y(CH2SiMe3)3(THF)2] with 3 equivalent benzyl alcohol were used as initiator for the controlled ring-opening polymerization (ROP) of ε-caprolactone (CL). 1H-NMR studies indicated that the PCLs obtained were caped by a benzyloxyl group at one end and an alcohol at the other. The number average molecular weight measured by 1H-NMR and GPC both increase linearly with the monomer/yttrium molar ratio with narrow melecular weight distribution (MWD). Moreover, the Mn measured by 1H-NMR agrees with the value of the calculated Mn, suggesting that the ROP of CL undergo a living manner.

Key words: Ring-opening polymerization, ε-Caprolactone, Yttrium complex

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