ポリビニルアルコール繊維の湿式紡糸過程と結晶化

川上 博, 三好 明

doi:10.2115/fiber.29.4_t166

ポリビニルアルコール繊維の湿式紡糸過程と結晶化

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川上博

ユニチカ株式会社中央研究所
三好明

ユニチカ株式会社中央研究所

書誌事項

タイトル別名

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

Crystallization was studied for wet-spun polyvinyl alchol (PVA) fibers prepared by various paths of composition change for which the ratio W_S/W_N, (W_S, the weight of solvent transfered from fibers into spinning bath and W_N, 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 W_S/W_N on spinning processes.