Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 69, Issue 3
Journal of the Society of Fiber Science and Technology
Displaying 1-9 of 9 articles from this issue
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Reviews and News
Foreword
Review
Report
Series of Reviews for High Performance Papers, Specialty Papers 3
Original Articles
Transaction
  • An Application of Functional UV Absorbers to Improve
    the Light Fastness of Gardenia Blue
    Hironori Oda, Sonomi Yamada, Akira Sugiyama
    Article type: Original Articles
    Subject area: Transactions
    2013Volume 69Issue 3 Pages 49-54
    Published: March 10, 2013
    Released on J-STAGE: April 09, 2013
    DOIhttps://doi.org/10.2115/fiber.69.49
    JOURNAL FREE ACCESS
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    Numerous potential UV absorbers were prepared to prolong the life of natural dye gardenia blue. The effect of these compounds in reducing photofading was examined on a polymer substrate. The use of commercial UV absorbers was not necessarily effective in improving the light fastness of the color. However, benzophenone type UV absorbers containing a built-in UV absorber moiety remarkably retarded the photofading rate. The combined use of these UV absorbers and singlet oxygen quencher played a very useful role in the photofading protection of natural dye. These stabilizers were deemed safe following evaluation of antimicrobial activity. It is proposed that 2,2',4,4'-tetrahydroxy-5-benzotriazolylbenzophenone and its derivatives may be used as effective stabilizers in the fading of natural dyes.
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Technical Paper
  • The Use of Vanadium for Dyeing Technology
    Yoshinobu UEGAKI, Makoto WATANABE, Makoto UTADA, Tetsuya SATO, Masako ...
    Article type: Original Articles
    Subject area: Technical Paper
    2013Volume 69Issue 3 Pages 55-59
    Published: March 10, 2013
    Released on J-STAGE: April 09, 2013
    DOIhttps://doi.org/10.2115/fiber.69.55
    JOURNAL FREE ACCESS
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    Mordant technology is often required for dyeing by natural dyes. The major problem with natural dyes is deepness of black color. So we analyzed the characteristic chromaticness with four kinds of natural dyes and three metals to improve it. We focused on vanadium, which is a transition element in a same period with iron or copper. Effective methods were found for the improvements of the dyeings with tetravalent vanadium compounds, vanadyl sulfate and tannin. Especially, tannic acid and gallic acid were hypochromically and fastly dyed on wool for the first time in the history of dyeing.
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Note
  • Unique Ferroelectricity and Structure of Nylon 39 Induced by an Electric Field
    Yasuhiro Matsuda, Osamu Achiwa, Masato Inagaki, Hidekazu Hirosawa, Shi ...
    Article type: Original Articles
    Subject area: Note
    2013Volume 69Issue 3 Pages 60-63
    Published: March 10, 2013
    Released on J-STAGE: April 09, 2013
    DOIhttps://doi.org/10.2115/fiber.69.60
    JOURNAL FREE ACCESS
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    The structure of nylon 39 in the presence of an electric field was investigated by infrared spectroscopy. The vibration peak of the N-H groups in nylon 39 in the presence of direct and alternative current shifted to a higher wavenumber, which was also observed in the infrared spectra of nylon 39 at higher temperatures. A very large dielectric constant for nylon 39 (2000 at 180℃) and remanent polarization were revealed by the dielectric relaxation spectra and displacement-electric hysteresis loops, respectively. These dielectric properties cannot be explained only by the arrangement of the dipole moments of N-H in nylon 39.The change in the infrared spectra and unique electric properties can be explained by the partial dissociation of the hydrogen bonds and the ionization of the amide groups in nylon 39.
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