Synthesis and characterization of poly(ϵ-caprolactone)–poly(L-lactide) diblock copolymers with an organic amino calcium catalyst

Authors

  • Longhai Piao,

    1. Nanosphere Process & Technology Laboratory, Division of Chemical Engineering and Biotechnology, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
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  • Jingru Sun,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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  • Zhiyuan Zhong,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
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  • Qizhi Liang,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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  • Xuesi Chen,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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  • Jung-Hyun Kim,

    1. Nanosphere Process & Technology Laboratory, Division of Chemical Engineering and Biotechnology, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
    2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
    3. Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
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  • Xiabin Jing

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
    • State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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Abstract

The quasiliving characteristics of the ring-opening polymerization of ϵ-caprolactone (CL) catalyzed by an organic amino calcium were demonstrated. Taking advantage of this feature, we synthesized a series of poly(ϵ-caprolactone) (PCL)–poly(L-lactide) (PLA) diblock copolymers with the sequential addition of the monomers CL and L-lactide. The block structure was confirmed by 1H-NMR, 13C-NMR, and gel permeation chromatography analysis. The crystalline structure of the copolymers was investigated by differential scanning calorimetry and wide-angle X-ray diffraction analysis. When the molecular weight of the PLA block was high enough, phase separation took place in the block copolymer to form PCL and PLA domains, respectively. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2654–2660, 2006

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