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Tetrahydrosalen-stabilized, chloride-containing rare-earth complexes: Facile initiator precursors for the preparation of hydroxytelechelic poly(ε-caprolactone)s

Authors

  • Guangming Wu,

    1. Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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  • Weilin Sun,

    Corresponding author
    1. Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
    • Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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  • Zhiquan Shen

    1. Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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Abstract

End-capped poly(ε-caprolactone)s (PCLs) have been prepared elsewhere by various initiators. However, hydroxytelechelic PCLs have been reported less frequently, although there are two hydroxyl end groups in one polymer chain, which allows diversified functionalization. Two tetrahydrosalen-backboned chlorides containing rare-earth complexes, YbLCl(DME)2 and ErLCl(DME) {where L is 6,6′-[ethane-1,2-diylbis(methylazanediyl)]bis (methylene)bis(2,4-di-tert-butylphenol) and DME is dimethoxyethane}, were first synthesized in this study, and they were used as initiator precursors for a ring-opening polymerization in the presence of NaBH4 to afford hydroxytelechelic PCLs. The polymerization under different conditions was investigated, and a possible mechanism is proposed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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