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

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (8): 1881.

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

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

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.

Abstract

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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LIANG Zhen-Hua, NI Xu-Feng*, SHEN Zhi-Quan. Controlled Ring\|opening Polymerization of ε-Caprolactone Initiated by in situ Formed Yttrium Tribenzyloxide Complex[J]. Chem. J. Chinese Universities, 2011, 32(8): 1881.

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

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