繊維学会誌
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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69 巻, 8 号
繊維学会誌
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  • 過炭酸ナトリウム漂白活性化剤共存下におけるペルオキシダーゼによる色素の退色反応機構
    森田 みゆき, 渡辺 貴子, 東 輝
    原稿種別: 報文
    専門分野: 一般報文
    2013 年 69 巻 8 号 p. 147-153
    発行日: 2013/08/10
    公開日: 2013/08/09
    DOIhttps://doi.org/10.2115/fiber.69.147
    ジャーナル フリー
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    The influence of a sodium percarbonate bleach activator in the peroxidase system was studied based on decoloration reaction kinetics of Orange II. When sodium nonanoyl oxybenzene sulphonate(NOBS) coexisted in the ricehull peroxidase(RPO) system, the decoloration rate of Orange II increased. In contrast, the addition of NOBS in the horseradish peroxidase(HRP) system did not increase the decoloration rate. The optimal coexistence conditions of NOBS in the RPO system were Tris/HCl buffer, pH 9.0, 6.7 × 10-4 M of NOBS, and 3.0 × 10-3 M of hydrogen peroxide. No positive effect of the DOBS coexistence in the RPO system was observed.
     The formed sodium p-phenolsulfonate in the RPO–NOBS coexistence system was further analyzed by HPLC. It is considered that an elimination group (sodium p-phenolsulfonate) formed by a bleach activator resolution reaction activated the RPO reaction and increased the decoloration rate of Orange II. The proposed decoloration mechanism of Orange II is as follows. NOBS disintegrates, and sodium p-phenolsulfonate and organic peroxy acid are formed. Sodium p-phenolsulfonate preferentially reacts with Compound I, forming a sodium p-phenolsulfonate radical. The sodium p-phenolsulfonate radical subsequently undergoes a radical reaction with Orange II. The formed organic peroxy acid causes the decomposition of Orange II radical.
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  • Preparation and Characterization of Glass Fiber Reinforced Composite with TiO2 Particulate
    S. Srinivasa Moorthy, K. Manonmani
    原稿種別: 報文
    専門分野: 一般報文
    2013 年 69 巻 8 号 p. 154-158
    発行日: 2013/08/10
    公開日: 2013/08/09
    DOIhttps://doi.org/10.2115/fiber.69.154
    ジャーナル フリー
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    Glass fiber reinforced polymer (GFRP) composites are widely employed in aerospace and automotive industries because of light weight, wear resistance with lower price. To have the better characteristics of GFRP composites, titanium oxide light metal filler was added in the unsaturated polyester resin matrix. The hybrid GFRP composites were made with 10 wt % of filler content and without the filler material. The integration of added filler material reinforcement and increased fiber content are compared and gives improved tensile, impact and hardness from the series of experiments. Chemical resistance and thermal property of GFRP composites were increased due to the hybrid reinforcement.
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ノート
  • 天然ゴムラテックスとin situシリカから作る
    パーオキサイド架橋ソフトコンポジット
    トーサン アチタヤ, ピンヨチープ プラニー, 浦川 宏, 池田 裕子
    原稿種別: 報文
    専門分野: ノート
    2013 年 69 巻 8 号 p. 159-162
    発行日: 2013/08/10
    公開日: 2013/08/09
    DOIhttps://doi.org/10.2115/fiber.69.159
    ジャーナル フリー
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    Peroxide cross-linked silica filled natural rubber composite was prepared from a commercial natural rubber (NR) latex containing ammonia and silica generated in situ by using a sol-gel reaction of tetraethoxysilane (TEOS). The silica content was ten parts per one hundreds rubber by weight. Morphology of the in situ silica in the soft composite, which was observed by transmission electron microscopy, showed that the in situ silica was formed into aggregates in a few hundreds nanometer level. Reinforcement effects of the in situ silica and strain-induced crystallization (SIC) were investigated by simultaneous time-resolved wide-angle X-ray diffraction and tensile measurements at SPring-8. The effect of silica filling in situ was larger than that of SIC in the soft composite. The sol-gel reaction of TEOS in the NR latex is supposed to have an advantage in generating an interaction between in situ silica and non-rubber components on the surface of rubber particles through quaternary ammonium ions. This interaction may bring about a unique mechanical properties to the in situ silica filled soft composite. The method using NR latex may be useful for preparation of high performance soft composites.
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