Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 62, Issue 10
Displaying 1-15 of 15 articles from this issue
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Column
Feature
The Society of Fiber S & T, Japan Prize for Excellence in Fiber Research
The Society of Fiber S & T, Japan Prize for Excellence in Fiber Technology
Transactions
  • Mechanical Properties and Higher Order Structures of
    Jae-Chang Lee, Yukiko Furuhashi, Yutaka Kawahara, Hideki Yamane
    2006 Volume 62 Issue 10 Pages 219-225
    Published: 2006
    Released on J-STAGE: January 10, 2007
    DOIhttps://doi.org/10.2115/fiber.62.219
    JOURNAL FREE ACCESS
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    Bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)(PHBH) highly oriented films were prepared by the combination of roll and uniaxial drawing processes. Compression molded films, which is rather brittle, turned to be ductile after roll drawing up to x 2, and the films were further uniaxially drawn to a draw ratio as high as 1000 %. The PHBH film with the tensile strength of 178 MPa and the modulus of 1.4 GPa were obtained. The roll drawn PHB film showed a slight crystalline orientation of Alpha-form. The orientation advanced with uniaxial draw ratio and the formation of Beta-form crystal was observed. Relations among the processing conditions, higher order structures and mechanical properties were investigated using wide-angle X-ray diffraction, differential scanning calorimetry, and tensile measurements.
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  • Purification and Properties of Diethyl p-Phthalate Esterase from Ochrobactrum anthoropi 6-2b
    Shichao Xu, Chie Komatsu, Ichiro Takahashi, Shin-ichiro Suye
    2006 Volume 62 Issue 10 Pages 226-231
    Published: 2006
    Released on J-STAGE: January 10, 2007
    DOIhttps://doi.org/10.2115/fiber.62.226
    JOURNAL FREE ACCESS
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    An esterase which hydrolyzes diethyl p-phthalate (diethyl terephthalate, DET) was obtained from Ochrobactrum anthoropi 6-2b. It was purified 19.1 fold to electrophoretic homogeneity with a yield of 26%. The purified esterase had a specific activity of 32.2umol min-1 mg-1-protein based on the hydrolysis of DET at pH 7.0 and 30deg. The enzyme showed maximum activity at pH 8.0 and was stable at pH 6.0-8.0 with optimum stability at pH 6.0. Its optimal temperature in reaction was 50deg., and it was stable below 40deg. Esterase activity was 89% inhibited by adding 1.0 mM Ni2+ and 82% inhibited by 1.0 mM phenylmethylsulfonyl fluoride. The esterase obeyed Michaelis-Menten kinetics, and in the hydrolysis of DET, Vmax and Km were 37.3 umol min-1 mg-1-protein and 1.17 mM, respectively. It was able to hydrolyze a number of p-phthalates and o-phthalates. Its molecular weight was 40,000 by gel filtration chromatography and 20,000 by sodium dodecyl sulfate polyacrylamide gel electrophoresis.
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  • Mechanical Properties and Flame Retarding Properties of Nylon Composites . -Relationship between Molecular Structures of Reactive Flame Retardants and Effects of Gamma-ray Crosslinking-.
    Toshiyuki Kanno, Hironori Yanase, Yoshinobu Sugata, Kiyotaka Shigehara
    2006 Volume 62 Issue 10 Pages 232-241
    Published: 2006
    Released on J-STAGE: January 10, 2007
    DOIhttps://doi.org/10.2115/fiber.62.232
    JOURNAL FREE ACCESS
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    In the present study were synthesized several reactive flame retardants (RFRs) carrying phosphorus- and
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