Nano-reactors for controlling the selectivity of the free radical grafting of maleic anhydride onto polypropylene in the melt

Authors

  • Dean Shi,

    Corresponding author
    1. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
    2. Faculty of Chemistry and Material Science, Hubei University, Wuhan 430062, People's Republic of China
    • Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
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  • R. K. Y. Li,

    1. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
    2. Faculty of Chemistry and Material Science, Hubei University, Wuhan 430062, People's Republic of China
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  • Yutian Zhu,

    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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  • Zhuo Ke,

    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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  • Jinghua Yin,

    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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  • Wei Jiang,

    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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  • Guo-Hua Hu

    Corresponding author
    1. Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, 54001 Nancy, France
    2. Institut Universitaire de France, Maison des Universités, 103 Boulevard Saint-Michel, 75005 Paris, France
    • Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, 54001 Nancy, France
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Abstract

This paper reports on a successful application of the concept of nanoreactors to effectively controlling the selectivity of the free radical grafting of maleic anhydride (MAH) onto polypropylene (PP) in the melt, an industrially relevant process. More specifically, a free radical initiator of type ROOR was first confined into (or encapsulated by) the galleries of an organically modified montmorillonite (o-MMT) whose interdistance was 2.4 nm. Primary free radicals (RO ·) formed inside the o-MMT galleries had to diffuse out before they could react with the PP backbone. The controlled release of the primary free radicals significantly increased the grafting degree of MAH onto PP and greatly reduced the level of the chain scission of the latter. Those results were better understood by electron spin resonance studies on model systems and by Monte Carlo simulations. POLYM. ENG. SCI. 46:1443–1454, 2006. © 2006 Society of Plastics Engineers.

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