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Pursuit of reinitiation efficiency of resonance-stabilized monomeric allyl radical generated via “degradative monomer chain transfer” in allyl polymerization

Authors

  • Satoshi Inoue,

    1. Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering and High Technology Research Center, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan
    2. Material Development Department, Research and Development Division, Daiso Co., Ltd., 9 Otakasu-cho, Amagasaki-shi, Hyogo 660-0842, Japan
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  • Takeo Kumagai,

    1. Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering and High Technology Research Center, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan
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  • Hajime Tamezawa,

    1. Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering and High Technology Research Center, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan
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  • Hiroyuki Aota,

    1. Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering and High Technology Research Center, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan
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  • Akira Matsumoto,

    Corresponding author
    1. Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering and High Technology Research Center, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan
    • Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering and High Technology Research Center, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan
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  • Katsutoshi Yokoyama,

    1. Material Development Department, Research and Development Division, Daiso Co., Ltd., 9 Otakasu-cho, Amagasaki-shi, Hyogo 660-0842, Japan
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  • Yasuo Matoba,

    1. Material Development Department, Research and Development Division, Daiso Co., Ltd., 9 Otakasu-cho, Amagasaki-shi, Hyogo 660-0842, Japan
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  • Michirou Shibano

    1. Material Development Department, Research and Development Division, Daiso Co., Ltd., 9 Otakasu-cho, Amagasaki-shi, Hyogo 660-0842, Japan
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Abstract

For a deeper understanding of allyl polymerization mechanism, the reinitiation efficiency of resonance-stabilized monomeric allyl radical was pursued because in allyl polymerization it is commonly conceived that the monomeric allyl radical generated via the allylic hydrogen abstraction of growing polymer radical from monomer, i.e., “degradative monomer chain transfer,” has much less tendency to initiate a new polymer chain and, therefore, this monomer chain transfer is essentially a termination reaction. Based on the renewed allyl polymerization mechanism in our preceding article, the monomer chain transfer constant in the polymerization of allyl benzoate was estimated to be 2.7 × 10−2 at 80 °C under the polymerization condition, where the coupling termination reaction of growing polymer radical with allyl radical was negligible and, concurrently, the reinitiation reaction of allyl radical was enhanced significantly. The reinitiation efficiencies of monomeric allyl radical were pursued by the dead-end polymerizations of allyl benzoate at 80, 105, and 130 °C using a small amount of initiators; they increased remarkably with raised temperature. Thus, the enhanced reinitiation reactivity of allyl radical at an elevated temperature could bias the well-known degradative monomer chain transfer characteristic of allyl polymerization toward the chain transfer in common vinyl polymerization. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010

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