Ring-open Polymerization of ε-Caprolactone Catalyzed by Substituted Indenyl Complexes

Chem. J. Chinese Universities

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Ring-open Polymerization of ε-Caprolactone Catalyzed by Substituted Indenyl Complexes

QI Min-Hua^1,2*, 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:2007-05-14 Revised:1900-01-01 Online:2007-12-10 Published:2007-12-10
Contact: QI Min-Hua

Abstract

Abstract: The substituted indenyl lanthanide(Ⅱ) complex (C₅H₉C₉H₆)₂Yb(THF)₂ applied to catalyzing the polymerization of ε-caprolactone was investigated. The results indicate that the complex (C₅H₉C₉H₆)₂·Yb(THF)₂ as single component catalyst showed a high activity, the conversion of the polymerization and the number-average molecular weight of the polymers were affected by temperature and time of polymerization, and using dose of the catalyst in polymerization process. The number-average molecular weight and molecular weight distribution of the polymer were not sensitive to temperature. But the conversion increased to increasing the polymerization temperature; molecular weight distribution of PCL gained was narrow. Other modified substituted indenyl lanthanide(Ⅱ) complexes also showed a good catalytic activity. The order of catalytic activity of the substituted indenyl lanthanide(Ⅱ) complexes was as follows: (1-C₂H₅C₉H₆)₂Sm(THF)₂>(1-C₅H₉C₉H₆)₂Sm(THF)>KSm(1-C₅H₉C₉H₆)₃(THF)₃>(1-PhCH₂C₉H₆)₂Sm(THF)₂>(1-C₅H₉C₉H₆)2Yb(THF)₂. The number-average molecular weight and molecular weight distribution of PCL was measured by GPC.

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

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QI Min-Hua^1,2*, SHEN Qi², SHEN Zhi-Quan³. Ring-open Polymerization of ε-Caprolactone Catalyzed by Substituted Indenyl Complexes[J]. Chem. J. Chinese Universities, doi: .

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Ring-open Polymerization of ε-Caprolactone Catalyzed by Substituted Indenyl Complexes

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