EFFECT OF WET-SPINNING PROCESSES ON CRYSTALLIZATION OF POLYVINYL ALCOHOL FIBERS

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  • ポリビニルアルコール繊維の湿式紡糸過程と結晶化
  • ポリビニルアルコール センイ ノ シッシキ ボウシ カテイ ト ケッショウカ ポリビニルアルコール センイ ノ シッシキ ボウシ カテイ ト センイ コウゾウ 2

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Description

Crystallization was studied for wet-spun polyvinyl alchol (PVA) fibers prepared by various paths of composition change for which the ratio WS/WN, (WS, the weight of solvent transfered from fibers into spinning bath and WN, the nonsolvent transfered from the bath into fibers) is the determing factor. Crystallinity index proposed by Wakelin was determined for the fibers by uses of the freeze-dried iso-PVA and single crystal of synd-PVA as the standard samples. Crystallinity indexes of PVA fibers obtained by this method are related closely to their resistance to hot water. This technique is also effective in measuring crystallinity of fibers on heating and cooling. The crystallinity index is not equal to the crystallinity determind from the intensity of halo on meridian, since the intensity of halo on meridian depends on orientation of amorphous chains.<br>It can be concluded that crystallinity of wet-spun PVA fibers increases with decreased WS/WN on spinning processes.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 29 (4), T166-T172, 1973

    The Society of Fiber Science and Technology, Japan

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