繊維学会誌
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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63 巻, 1 号
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  • 高分子量ポリL-乳酸/ポリD-乳酸ブレンド試料の延伸によるステレオコンプレックス晶の生成と延伸物の力学物性
    澤井 大輔, 玉田 真規, 横山 隆文, 金元 哲夫, 玄 丞烋, 文 成日
    2007 年 63 巻 1 号 p. 1-7
    発行日: 2007年
    公開日: 2007/02/10
    DOIhttps://doi.org/10.2115/fiber.63.1
    ジャーナル フリー
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    The structural changes and development of morphology, crystal structure and mechanical property upon uniaxial drawing of an equimolar blend of high-molecular weight poly(L-lactic acid)/poly(D-lactic acid) (PLLA/PDLA) were investigated. Solvent-cast film of the blend were drawn by a tensile force and solid-state coextrusion. The initial film was consisted predominantly of α-form crystals and a small amount of stereocomplex (SC) crystals. Although the amount of SC did not increase upon annealing the solvent-cast film at 200°C, it increased (with draw ratio) upon drawing by either of the draw techniques when the draw was performed in the temperature range between the melting temperature of α-form crystals (Tmα = 170-180°C) and SC (TmSC = 220 °C). Upon drawing at a given temperature, SC formed significantly more rapidly with draw ratio for the solid-state coextrusion than for the tensile drawing. Thus, an oriented product consisting of only SC was obtained by the solid-state coextrusion at Te = 200 °C to an extrusion draw ratio of 16, even for a high-molecular weight PLLA/PDLA blend, although the formation of SC in such a blend has been shown to be difficult in bulk from melt or in solution. The dynamic Young's moduli of SC samples above Tg (∼60 °C) was significantly higher than that of an α-form sample.
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  • 黄蘗色素の絹に対する染着と固着に及ぼすタンニンの影響
    金 惠仁, 朴 秀敏
    2007 年 63 巻 1 号 p. 8-14
    発行日: 2007年
    公開日: 2007/02/10
    DOIhttps://doi.org/10.2115/fiber.63.8
    ジャーナル フリー
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    As the basic study to investigate the mechanism of improvement in the dyeing fastness of natural dyes on silk fabrics, the optical behavior of tannin solution, the optimal condition of tannin treatment and the changes of the physical structure of silk fabrics were studied in the treatment of tannin. As the tannin content of silk fabric was increased, the value of ξ-potential became negative. As the tannin content of silk fabric was increased, the crystallinity and crystallite size were decreased. The degree of orientation was also decreased with the tannin treatment. As the concentration of tannin was increased in its treating condition, the tannin content and K/S value of tannin-treated silk fabrics were increased. Because tannin gave rise to yellowing by hydrolysis and oxidation at high temperature, the higher tannin-treating temperature resulted in the lower the tannin content and K/S values of silk fabrics. The tannin content of silk fabric was higher in acidic treating condition and the highest K/S value was showed at pH 5. The optimum condition of tannin pre-treatment was 0.15% concentration, pH 4, 70°C, and 45min, and that of post-treatment was 0.05% concentration, 60°C, and 30min. The wash fastness and the light fastness were enhanced to 4 grades and 2~3 grades, respectively.
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