Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 57, Issue 11
Composite and hybrid materials
Displaying 1-14 of 14 articles from this issue
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Commentations
The Society of Fiber S & T, Japan Prize for Excellence in Fiber Research
The Society of Fiber S & T, Japan Prize for New Fiber Technology
Series - State of the art of fiber technologies
Reports
Transactions
  • Anisotropic Electric Conductivity and Light Transmittance of Polypyrrole/Poly(vinylidene fluoride) Composites Film by Polymerization in Craze
    Akiyoshi Takeno, Masaya Yoshimura, Minoru Miwa, Teruyuki Yokoi
    Article type: scientific monograph
    Subject area: Infomation Science
    2001 Volume 57 Issue 11 Pages 301-305
    Published: 2001
    Released on J-STAGE: June 01, 2002
    DOIhttps://doi.org/10.2115/fiber.57.301
    JOURNAL FREE ACCESS
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    Pyrrole was impregnated and polymerized in the voids of the regular crazes that were generated in poly(vinylidene fluoride) (PVDF) film by the unique crazing process. The spontaneous cyclic process of the stress concentration and releasing generated the periodical craze layers. The composites films were formed by the conductive layers of polypyrrole(PPy) and the insulator layers of PVDF, alternatively. Anisotropic electric conductivity about three orders of magnitude between the thickness or perpendicular direction and the parallel direction to the processing direction was investigated. Black PPy layers absorbed all of the incident light from the tilted angle and PVDF layers transmitted the incident light from the normal angle. Anisotropic transparency that provides the black-colored composites film from tilted viewpoint and the transparent film from the normal viewpoint was observed (View field selectivity).
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  • Interfacial Effect of Urethane Binder in Glass Fiber Thermoplastic Composites
    Akira Yanagawa, Harumichi Tanaka, Nobuo Ikuta, Jun Takeshita, Hiroyuki ...
    Article type: scientific monograph
    Subject area: Infomation Science
    2001 Volume 57 Issue 11 Pages 306-310
    Published: 2001
    Released on J-STAGE: June 01, 2002
    DOIhttps://doi.org/10.2115/fiber.57.306
    JOURNAL FREE ACCESS
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    Interfacial reinforcement with urethane binder (UB) was investigated in a couple of thermoplastic composites, glass fiber / polycarbonate (GF / PC) and glass fiber / polypropylene (GF / PP). In the surface treatment, silane used as another agent was aminopropyltriethoxysilane (APS). Glass fiber was treated with UB+APS, UB, or APS, and was applied to thermoplastic composites. In interfacial strength test, UB was effective in GF / PC, but ineffective in GF / PP. In order to clarify interfacial effect with UB on PC and PP, the diffusion of UB to resin was analyzed by microscopic FT-IR spectroscopy. As a result, the diffusion appeared in PC matrix, but not in PP matrix. In addition, APS depressed the diffusion of UB in PC including GF with APS+UB. These results suggested that the interfacial reinforcement needed not only the interaction between UB and resin, but also the interaction between silane and UB to produce the mechanical linkage from resin to fiber. This suggestion was supported from the interfacial strength in some other composites with matrix resin such as polybutylene terephthalate, polyamide 66, and copolymer of acrylonitrile and styrene.
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  • Fabrication of EB Cured Textile Composites (I)
    - Effect of Total Dose on Mechanical Properties of Plain Woven Fabric Composites -
    Toshiko Osada, Machiko Mizoguchi, Asami Nakai, Hiroyuki Hamada, Mitsuk ...
    Article type: scientific monograph
    Subject area: Infomation Science
    2001 Volume 57 Issue 11 Pages 311-316
    Published: 2001
    Released on J-STAGE: June 01, 2002
    DOIhttps://doi.org/10.2115/fiber.57.311
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    There are significant advantages to be gained in Electron Beam (EB) processing of composite materials over conventional thermal curing, such as, much shorter cure times than thermal curing, reduced thermal stresses in the cured part. In this study, effects of dose on mechanical properties of EB cured composites were investigated. Tensile testing of EB rayed glass fabric, dynamic mechanical analysis of EB cured resin, and evaluation of interfacial properties were performed. Moreover, tensile testing of EB cured woven fabric composites was conducted. Glass fiber was not affected by rayed dose. The best condition to cure resin was 90kGy, and too much dose caused degradation of resin. Interfacial properties of composites cured with over 90kGy were the same, and good adhesion at interface in composites was observed at 90kGy. Composites cured with 90kGy showed the highest mechanical properties.
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  • Mechanical Properties of Carbon Fiber Felt Reinforced Composites
    Jaehyun Kim, Masatoshi Shioya, Junichi Kaneko, Masahiko Kido
    Article type: scientific monograph
    Subject area: Infomation Science
    2001 Volume 57 Issue 11 Pages 317-325
    Published: 2001
    Released on J-STAGE: June 01, 2002
    DOIhttps://doi.org/10.2115/fiber.57.317
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    The carbon fiber reinforced composites were fabricated by using as the preform the felts produced by the needle punching of the alternate stack of carbon fiber webs and carbon fiber woven fabrics. The influences of the needle punching density and the style of the woven fabrics on the mechanical properties of the composites were investigated. The interlaminar and the damage tolerant properties of the composites were markedly improved with increasing needle punching density although there is some trade-off in their tensile properties.
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  • A Consideration of Fundamental Material Recycle of Epoxy Resin.
    Teruyuki Yokoi, Minoru Miwa, Akiyosi Takeno, Jiro Sano, Akira Watanabe
    Article type: scientific monograph
    Subject area: Infomation Science
    2001 Volume 57 Issue 11 Pages 326-331
    Published: 2001
    Released on J-STAGE: June 01, 2002
    DOIhttps://doi.org/10.2115/fiber.57.326
    JOURNAL FREE ACCESS
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    Epoxy resin is a typical thermosetting resin used as a matrix for composites, and generally difficult to recycle. As a first step of material recycle, reprocessed epoxy resin was prepared with ground epoxy resin. We measured the tensile properties of reprocessed epoxy resins with different volume fraction of ground epoxy resin. The breaking strength and breaking strain lowered with increasing the size and the volume fraction of ground resin. The tensile breaking strength and breaking strain increased slightly with the reciprocal of square root of particle size. We discussed the relation between cross-linking density and tensile property of resins, and found an experimental equation representing the results.
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Notes
  • Effects of Processing Sequence on Electrical Resistivity of Carbon Black Filled PP/PE Polymer Blends
    Kenji Nagata, Naoki Toge, Tsuyoshi Matsumoto, Reiko Sasamori, Kiyohisa ...
    Article type: scientific monograph
    Subject area: Infomation Science
    2001 Volume 57 Issue 11 Pages 332-333
    Published: 2001
    Released on J-STAGE: June 01, 2002
    DOIhttps://doi.org/10.2115/fiber.57.332
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    Effects of processing order on the electrical resistivity of carbon black(CB) filled polypropylene/poly- ethylene(PP/PE) polymer blends have been investigated. The weight composition of PP/PE is set on around 40/60, at which the cocontinuity of the phases occurs. Two types of processing sequence have been examined ; (A) simultaneous mixing of PP, PE and CB, and (B) mixing PP with CB in advance, followed by mixing PE with the PP/CB mixture. The method (B) was proposed by Gubbels et al.[2] as the condition for the selective localization of CB at the interface of PS/PE blends. In this paper, it has been shown that the method (B) is useful to make the composite whose resistivity is less sensitive to CB content [3] and also to make the PTC (positive temperature coefficient) material. Compared with the method (A), the method (B) has exhibited ; (1) lower resistivit y at CB content from 10 to 12phr, (2) smaller variation of resistivity with the increase of CB content, (3) larger increase of resistivity with the increase of temperature (PTC intensity). These results suggest the formation of a conductive network at the interface between PP and PE by the method (B).
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Rapid Communications
  • Influence of Sock's Shape for Wearing Comfort of Casual Socks
    Toshio Matsuoka, Toyonori Nishimatsu, Tomohiko Hananouchi, Masayoshi K ...
    Article type: scientific monograph
    Subject area: Infomation Science
    2001 Volume 57 Issue 11 Pages 334-337
    Published: 2001
    Released on J-STAGE: June 01, 2002
    DOIhttps://doi.org/10.2115/fiber.57.334
    JOURNAL FREE ACCESS
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    We investigated how the shape of socks influences the wearing comfort of casual socks. The adjectives used for sensory evaluation of wearing comfort were examined by the technique of the information theory. In the case of socks having different top lengths, the wearing comfort was evaluated by “easy to wear”, “stretch” and “good fit”, and the transmitted informations of the adjectives “pressure” and “stretch at the calf” are more than the other adjectives of the wearing comfort of socks. In the case of socks having different leg lengths, the wearing comfort was evaluated “stretch” and “pressure at the top”, and the transmitted informations of the adjectives “stretch at the calf” and “slipping down from the top” are more than the other adjectives.
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