Synthesis of biopolyols by mild oxypropylation of liquefied starch and its application to polyurethane rigid foams

Authors

  • Mariko Yoshioka,

    Corresponding author
    1. Division of Forest & Biomaterials Science, Graduate School of Agriculture, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
    • Division of Forest & Biomaterials Science, Graduate School of Agriculture, Kyoto University, Oiwake-Cho, Kitashirakawa, Sakyo-Ku, Kyoto 606-8502, Japan
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  • Yoshiyuki Nishio,

    1. Division of Forest & Biomaterials Science, Graduate School of Agriculture, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
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  • Daisuke Saito,

    1. Functional Chemicals R & D Department, Dai-ichi Kogyo Seiyaku Company, Limited, 5 Ogawara-cho, Kisshoin, Minami-ku, Kyoto 601-8391, Japan
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  • Hironori Ohashi,

    1. Functional Chemicals R & D Department, Dai-ichi Kogyo Seiyaku Company, Limited, 5 Ogawara-cho, Kisshoin, Minami-ku, Kyoto 601-8391, Japan
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  • Masayuki Hashimoto,

    1. Functional Chemicals R & D Department, Dai-ichi Kogyo Seiyaku Company, Limited, 5 Ogawara-cho, Kisshoin, Minami-ku, Kyoto 601-8391, Japan
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  • Nobuo Shiraishi

    1. Shiraishi Biomass Company, Limited, 225 Arayama, Mineyama-cho, Kyotango 627-0004, Japan
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Abstract

The liquefaction of starch in the presence of commercial polyol resulted in liquefaction products (LPs) with much lower hydroxyl values compared to those resulting from glycerol liquefaction. With the use of the obtained LPs (as initiators) and a catalytic amount of potassium hydroxide, oxypropylation was conducted under mild conditions (at 120°C, inner pressure generation of <0.2 MPa). Urethane resin foams were prepared from the obtained biopolyols. The reactivities of the biopolyols toward isocyanates were almost the same as those of commercial polyols. The physical properties of the obtained foams were as good or better than the ones obtained with the commercial polyols, including the sucrose/glycerol polyol GR-84T. The biomass content values of the foams prepared with the biopolyols ranked among the highest in the world. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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