High Effective Ring-open Polymerization of ε-Caprolactone Catalyzed by Bicycolopentadienyl Samarium(Ⅱ) Complex (C5H5)2Sm(THF)

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (12): 2518.

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High Effective Ring-open Polymerization of ε-Caprolactone Catalyzed by Bicycolopentadienyl Samarium(Ⅱ) Complex (C₅H₅)₂Sm(THF)

QI Min-Hua^1,2*, JIA Hui-Fang¹, LIU Zhi-Sheng¹, SHEN Qi², SHEN Zhi-Quan³

1. Institute of Chemical Engineering, Maoming College, Maoming 525000, China;
2. Department of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215006, China;
3. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received:2010-02-01 Revised:2010-05-15 Online:2010-12-10 Published:2010-12-06
Contact: QI Min-Hua E-mail:qiminhua2002@sohu.com
About author:齐民华, 男, 博士, 副教授, 主要从事金属有机配合物合成及催化聚合性能的研究.
Supported by:
National Natural Science Foundation of China

Abstract

Abstract: Lanthanide (II) complex (C5H5)2Sm(THF) applied in catalyzing the polymerization of ε-caprolactone was investigated. The results indicated that the complex as single component catalyst showed very high activity and the number-average molecular weight of the polymer gained was also very high. For example, when the molar ratio of catalyst to monomer was 1/5000, the conversion could still reach 50.3% and the number-average molecular weight of the polymer gained was as high as 32.4?104. The conversion of the polymerization and the number-average molecular weight of the polymers were affected by temperature, time of polymerization and use level of catalyst in polymerization process. The number-average molecular weight of the polymer decreased, the molecular weight distribution was slightly wide, but the conversion increased as the polymerization temperature increasing. The conversion increased and the number-average molecular weight decreased as the dosage of catalyst increased. The molecular weight distribution of polycaprolactones gained were narrow. The number-average molecular weight and molecular weight distribution of polycaprolactone were measured by GPC.

Key words: Samarium, Lanthanide complex, ε-Caprolactone, Ring-opening polymerization

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QI Min-Hua, JIA Hui-Fang, LIU Zhi-Sheng, SHEN Qi, SHEN Zhi-Quan. High Effective Ring-open Polymerization of ε-Caprolactone Catalyzed by Bicycolopentadienyl Samarium(Ⅱ) Complex (C₅H₅)₂Sm(THF)[J]. Chem. J. Chinese Universities, 2010, 31(12): 2518.

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High Effective Ring-open Polymerization of ε-Caprolactone Catalyzed by Bicycolopentadienyl Samarium(Ⅱ) Complex (C₅H₅)₂Sm(THF)

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