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High tensile strength fiber of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] processed by two-step drawing with intermediate annealing

Authors

  • Taizo Kabe,

    1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
    2. Structural Materials Science Laboratory, RIKEN Harima Institute, Sayo-gun, Hyogo, Japan
    3. Japan Science and Technology Agency, CREST, Kawaguchi, Saitama, Japan
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  • Chizuru Hongo,

    1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
    2. Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe-shi, Hyogo, Japan
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  • Toshihisa Tanaka,

    1. Structural Materials Science Laboratory, RIKEN Harima Institute, Sayo-gun, Hyogo, Japan
    2. Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano, Japan
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  • Takaaki Hikima,

    1. Research Infrastructure Group, RIKEN Harima Institute/SPring-8 Center, Sayo-gun, Hyogo, Japan
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  • Masaki Takata,

    1. Structural Materials Science Laboratory, RIKEN Harima Institute, Sayo-gun, Hyogo, Japan
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  • Tadahisa Iwata

    Corresponding author
    1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
    2. Structural Materials Science Laboratory, RIKEN Harima Institute, Sayo-gun, Hyogo, Japan
    3. Japan Science and Technology Agency, CREST, Kawaguchi, Saitama, Japan
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ABSTRACT

High tensile strength fibers of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] [P(3HB-co-3HH)], a type of microbial polyesters, were processed by one-step and two-step cold-drawn method with intermediate annealing. Thermal degradation behaviors were characterized by differential scanning calorimeter and gel permeation chromatography measurements. Thermal analyses were revealed that molecular weights decreased drastically within melting time at a few minute. One-step cold-drawn fiber with drawing ratio of 10 showed tensile strength of 281 MPa, while tensile strength of as-spun fiber was 78 MPa. When two-step drawing was applied for P(3HB-co-3HH) fibers, the tensile strength was led to 420 MPa. Furthermore, the optimization of intermediate annealing condition leads to enhance the tensile strength at 552 MPa of P(3HB-co-3HH) fiber. Wide-angel X-ray diffraction measurements of these fibers suggest that the fibers with high tensile strength include much amount of the planer-zigzag conformation (β-form) as molecular conformation together with 21 helix conformation (α-form). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41258.

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