THE THERMAL RETRACTIVE FORCE OF DRAWN POLYPROPYLENE FIBERS TREATED AT RELATIVELY LOW TEMPERATURES

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  • Matsumoto Iwao
    Department of Fiber and Polymer Technology, Faculty of Engineering, Gunma University
  • Fuchino Keiroku
    Department of Fiber and Polymer Technology, Faculty of Engineering, Gunma University

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Other Title
  • 比較的低温度で処理した延伸ポリプロピレン繊維の熱収縮力
  • ヒカクテキ テイオンド デ ショリ シタ エンシン ポリプロピレン センイ ノ ネツ シュウシュクリョク

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Abstract

The thermal retractive force f of hot-drawn Polypropylene (P. P) fibers, drawn at temperatures higher than 80°C, shows a maximum (fmax) at temperature (T) and the values of fmax varies with the clamp length (_??_initial length of a filament). When the fibers are drawn at a prescribed temperature and the values of fmax are obtained by the various clamp lengths, the following linear relation are found: fmax=k•(T-T0), where both k and T0 are constant. Also point S, whioh is determined by the drawing and heat-treatment conditions and gives the limited condition for the reversible stress change with temperature as the drawn and heat-treatment length are kept constant, is located on the above mentioned straight line (see Fig.1)<br>In the present investigation it was tried to determine whether this relation might be applied to the drawn fibers treated at temperatures below 80°C.<br>The maximum of the thermal retractive force of the drawn P. P fibers treated at relatively low temperatures behaved in the same manner as those treated at high temperatures. But the fmax, responding to the change of internal structure in heating, was not always stable, and thus the unstable ones disappeared after a period of time and the other stable ones, which is independent of time, behaved as if the samples had been treated at 80°C.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 27 (9), 375-380, 1971

    The Society of Fiber Science and Technology, Japan

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