Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 66, Issue 11
Displaying 1-11 of 11 articles from this issue
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  • Bending Properties of Fiber-Hybrid I-shaped Braided Composite
    Masaharu Shinokubo, Akio Ohtani, Asami Nakai, Hiroyuki Hamada, Tadashi ...
    2010 Volume 66 Issue 11 Pages 267-271
    Published: November 10, 2010
    Released on J-STAGE: December 10, 2010
    DOIhttps://doi.org/10.2115/fiber.66.267
    JOURNAL FREE ACCESS
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    Braided fabrics are suitable for structural members of Fiber Reinforced Plastics (FRP) as the reinforcement. The braided fabric can be fabricated into various cross-sectional shape such as tube, rectangular, I-shape, L-shape structures and so on. By using this braiding technique, near net-shape products with continuity of the reinforcing fibers can be achieved, so excellent mechanical properties were expected. In addition, unidirectional fiber bundles can be inserted into braided fabric and various types of fiber bundles and number of fiber bundles can be changed according to the required design.
    In this study, in order to investigate the fiber hybrid effect on the mechanical properties of FRP, several kinds of hybrid I-shaped braided fabric with glass and carbon fibers were fabricated and used for the reinforcement of I-beam composites. The bending properties were examined with 4-point bending test, and bending strength of the hybrid specimens was improved by optimally combining the glass and the carbon fiber compared with the specimen with sole carbon fiber with keeping bending modulus.
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  • Effects of Some Relaxation Treatments on the Waving Performance of the Permanent Waving Procedure of Human Hair
    Keiko Sakurai, Kyohei Joko
    2010 Volume 66 Issue 11 Pages 272-279
    Published: November 10, 2010
    Released on J-STAGE: December 10, 2010
    DOIhttps://doi.org/10.2115/fiber.66.272
    JOURNAL FREE ACCESS
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    The relaxation behavior on the permanent waving performance of human hair were investigated. According to a standard procedure simulating commercial practice, hair tresses were wrapped on a rod 12mm in diameter and were waved by immersing in 5% thioglycolic acid solution, rinsing with water and neutralization with sodium bromate solution. The relaxation processing was applied after water rinse and carried out remaining the rod under the various conditions for a certain period of time. The effects of the relaxation processing were observed for the hair samples treated for 3-15 minutes with the reduction solution. This wave imparted by added relaxation processing was stronger and shorter than in the absence of relaxation. This indicates that the mechanical relaxation may occur simultaneously and moderately with the protein chains of keratin structure with a much lower conversion of disulfide to sulfhydril group. Accordingly, if the permanent waving of hair is carried out by the produce involving the relaxation processing, the reduction state in the hair necessary for the protein chain rearrangement to equilibrium with the curled configuration can be attained with a smaller concentration of sulfhydril groups, so that the permanent waving produce involving the relaxation processing results in major benefits of fiber degradation as observed by appearance and feel.
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  • Tensile Strength and Conductive Performance of PVA & PEDOT⁄PSS Blended Fiber
    Hiroaki Miura, Katsumi Morohoshi, Jun Okada, Banjia Lin, Mutsumi Kimur ...
    2010 Volume 66 Issue 11 Pages 280-283
    Published: November 10, 2010
    Released on J-STAGE: December 10, 2010
    DOIhttps://doi.org/10.2115/fiber.66.280
    JOURNAL FREE ACCESS
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    An electroconductive polymer, poly-3,4-ethylenedioxithiophene⁄poly-styrenesulphonic acid (PEDOT⁄PSS) is noticed because it has high generality, electroconductivity, and transparency. We are considering practicability of a cloth sensing device made of electroconductive polymer fibers. However, as the tensile strength of pure PEDOT⁄PSS fiber is low, it is not suitable for fabricating devices. We examined a possibility of coexisting of high conductivity and high strength by blend fibers consisting of an electroconductive polymer and another polymer (polyvinyl alcohol: PVA). A tensile strength of the PEDOT⁄PSS and PVA blend fibers was about twice as that of the pure PEDOT⁄PSS fiber. The electroconductivity of the blend fibers also increased several times despite of decreasing amount of conductive polymer. The Raman spectrum revealed that the comformation of PEDOT was changed into a linear or expanded coil comformation by combining with PVA.
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  • Highly Sensitive Sizing Response Induced by 2-Bromination of Fatty Acids and their Pairing with Anchor Sites Formed on Paper Surfaces
    Takuya Kitaoka, Nobuo Tanaka, Kana Matsuyama, Hiroki Yamamoto
    2010 Volume 66 Issue 11 Pages 284-287
    Published: November 10, 2010
    Released on J-STAGE: December 10, 2010
    DOIhttps://doi.org/10.2115/fiber.66.284
    JOURNAL FREE ACCESS
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    The base handsheets were prepared from a pulp suspension containing either aluminum sulfate (alum) or polydiallyldimethylammonium chloride (PDADMAC), followed by being soaked in the chloroform solution of stearic and palmitic acids (SPA), which were brominated, or non-brominated, at the α-carbon positions adjacent to respective carbonyl groups. No sizing effect was observed in the absence of alum or PDADMAC, and thus these additives that form anchor sites for size components were indispensable for sizing appearance. Besides, extremely different sizing responses were found, strongly depending on the combinations of fatty acids and additives. Alum-treated handsheets showed good sizing effects by dipping them in an SPA⁄chloroform solution; however sizing with 2-brominated SPA (Br-SPA) had no contribution to sizing appearance. By contrast, PDADMAC-handsheets sized with Br-SPA exhibited high sizing degrees, although there was no sizing effect in the case of using non-brominated, original SPA. Highly sensitive sizing responses would provide a new insight to elucidate paper sizing mechanisms.
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