DEUTERATION BEHAVIOUR OF RAMIE CELLULOSE

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  • ラミーセルロースの重水素化挙動
  • ラミーセルロース ノ ジュウスイソカ キョドウ

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Abstract

In order to compare the deuteration behavior of ramie to that of Valonia, a ramie sheet was deuterated at high temperatures up to 210°C, followed by rehydrogenation with H2O vapor at room temperature.<br>The following results are obtained:<br>1) In the room temperature deuteration or rehydrogenation, the correlation between the fraction of residual OH or OD groups and log (1+t) is expressed by three intersecting lines of different gradients, where t is the integrated time of deuteration or rehydrogenation. From the results it is concluded that ramie can be devided into amorphous (A), intermediate (B) and crystalline regions (C) similar to the case of Valonia reported previously. However, in the case of ramie the region C is invaded by a deuterate reaction very slowly at room temperature in contrast with that of Valonia, which completely resists to the room temperature deuteration.<br>2) The amount of resistant OD groups developed in the region C in ramie is higher than in Valonia in the high temperature deuteration.<br>3) OD groups developed in the region C cannot be rehydrogenated with alkaline solution unless its concentration is sufficiently as high as to mercerize ramie. From (1) - (3) it is concluded that the crystalline region of ramie is of the lower order than Valonia.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 28 (10), 387-391, 1972

    The Society of Fiber Science and Technology, Japan

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