Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 67, Issue 9
Displaying 1-11 of 11 articles from this issue
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  • Surface Modification of a PET Substrate Through the Controlled Graft Polymerization and Application to the PET ⁄ Apatite Hybrids Formation
    Jin Motoyanagi, Yugo Fukumoto, Naoki Ohta, Masahiko Minoda
    2011 Volume 67 Issue 9 Pages 193-199
    Published: September 10, 2011
    Released on J-STAGE: October 10, 2011
    DOIhttps://doi.org/10.2115/fiber.67.193
    JOURNAL FREE ACCESS
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    Organic ⁄ inorganic hybrid materials have attracted much attention because they are capable of combining the characteristic features of both organic and inorganic substances. This study aims to fabricate novel hybrids consisting of PET and apatite as components and to improve the mechanical properties of the hybrid through designing the interfacial structure between PET and an apatite layer. To this end, a PET substrate was modified with graft polymer chains bearing Si(OCH3)3 functions through the surface-initiated atom transfer radical polymerization (ATRP) and then subjected to the hybrid formation with apatite by a process mimicking biomineralization. This process was achieved by soaking the surface-modified PET substrate in a simulated body fluid (SBF) with ion concentrations nearly equal to human blood plasma. In this study, the PET substrate was modified with hyperbranched graft polymers with pendant Si(OCH3)3 functions, then coated with a calcium silicate gel and finally soaked in SBF for 3d to form the target PET ⁄ apatite hybrid. To evaluate the effects of the surface modification with grafted polymers on the mechanical properties of the PET ⁄ apatite hybrid, the interfacial bond strength between the PET substrate and the apatite layer was estimated by a peel test using a commercial adhesive tape.
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  • Anti-yellowing Finishing of Nylon Fiber Using a Reaction with Reducing Sugar (2)
    -Reaction in Aqueous Solution Containing a Reducing Reagent-
    Takeru Ohe, Yurika Yoshimura
    2011 Volume 67 Issue 9 Pages 200-205
    Published: September 10, 2011
    Released on J-STAGE: October 10, 2011
    DOIhttps://doi.org/10.2115/fiber.67.200
    JOURNAL FREE ACCESS
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    It is well known that nylon fibers turn yellow during long storage in a wood box or corrugated carton because of the reaction of the fibers with the aromatic aldehyde contained in the crude paper or wood. In our previous paper, a protective reaction of the amino groups in nylon fibers by a reducing sugar in organic solvents prevented them from turning yellow caused by vanillin, which is one of the aromatic aldehydes. In this paper, the same reactions were performed in an aqueous solution, which is generally very safe and useful for industrial applications, including these for various environmental problems. Interestingly, the reaction of nylon 6 fibers with a reducing sugar in an aqueous solution containing a reducing reagent such as sodium hydrosulfite prevented their color from changing to brown due to a melanoidin reaction, and the obtained nylon 6 fibers exhibited good anti-yellowing effects against vanillin.
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Technical Paper
  • Removal of Bacteria in Water with Cationic Polyester Fibers
    Yasuhito Kondo, Hideyuki Annaka, Masahiro Fujita, Hiroh Kubokawa, Masa ...
    2011 Volume 67 Issue 9 Pages 206-209
    Published: September 10, 2011
    Released on J-STAGE: October 10, 2011
    DOIhttps://doi.org/10.2115/fiber.67.206
    JOURNAL FREE ACCESS
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    We developed an effective system to eliminate microorganisms from environmental water using cationic polyester fibers. The polyester fibers were cationized by dipping with 1% Poly (diallyldimethyammonium chloride) solution. The zeta potential of polyester fiber particles and some bacteria was measured using microscopic electrophoresis. The mean zeta potential of regular polyester fiber particles was -25mV and cationic polyester fiber particles was +45mV. The mean zeta potential of the bacteria, Bacillus subtilis was -15mV, Escheria coli, -25mV Legionella pneumophila, -25mV. The microbial suspension is pumped through the cationic polyester fiber filter. Bacteria electro-adsorption to the cationic polyester fibers was examined by bioassay. Relatively large numbers of bacteria could be removed by adsorption to the cationic polyester fiber. It was observed by electron microscopy that the bacteria adsorbed on the surface of cationic polyester fibers.
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