Facile and efficient synthesis of hyperbranched polyesters based on renewable castor oil

Authors

  • Youmei Bao,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
    2. Graduate School of the Chinese Academy of Sciences, Changchun Branch, China
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  • Jing He,

    1. College of Environment and Chemical Engineering, Yanshan University, Qinhuangdao, China
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  • Yuesheng Li

    Corresponding author
    1. College of Environment and Chemical Engineering, Yanshan University, Qinhuangdao, China
    • State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
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Correspondence to:Yuesheng Li, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China. College of Environment and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China. E-mail: ysli@ciac.jl.cn

Abstract

Hyperbranched polyesters with thioether linkages were facilely prepared from methyl 10-undecenoate, a castor oil-derived renewable chemical. The monomer was obtained in excellent yield through thiol–ene click chemistry in the presence of catalytic amounts of photoinitiator under UV irradiation. Subsequent bulk polycondensation via a transesterification process catalyzed by Ti(OBu)4, Sb2O3 or Zn(OAc)2 gave hyperbranched polyesters with high molecular weights and unusual crystalline properties. The degree of branching in the range 0.45 − 0.54 calculated from quantitative 13C NMR spectroscopy and low inherent viscosities of 0.16 − 0.25 dL g−1 strongly confirmed the hyperbranched structures of the resultant polymers. © 2012 Society of Chemical Industry

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