架橋型湿式紡糸法による超高強力ポリビニルアルコール繊維に関する基礎的研究
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概要
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(1) Polyvinyl alcohol(PVA) fibers were manufactured by the use of a 15% PVA aqueous solution, including 1% boric acid against PVA, as the spinning solution, and a saturated sodium sulphate solution with added sodium hydroxide as the coagulating bath at 40℃. The characteristics of this spinning process and the mechanism of coaguration were investigated. The experimental results obtained are; i) Interaction between boric acid and PVA which undergone structural orientation results in cross linkages allowing drawing, but that between boric acid and nonoriented PVA results in crosslinkages which do not allow drawing, ii) This spinning method enables the manufacture of PVA monofilaments of large denier which was not attained by the conventional wet spinning method, but to get ultrahigh strength polyvinyl alcohol fibers by this spinning method, to produce small denier fibers was fitted. (2) Crosslinking mechanism of aqueous alkaline solution of PVA in the existence of boric acid was investigated by means of ^<11>B NMR. 2-Propanol and 2,4-pentanediol were chosen as monomeric and dimeric model samples of PVA, respectively. In the case of 2-propanol, only one strong signal was observed which was the same as in the case without alcohol. On the oher hand 2,4-pentanediol and PVA had two distinct signals one of which was unique to 1,3-diols, i. e., pentanediol and PVA. It is concluded that monohydroxyl alcohol does not react with boric acid, whereas di-and polyhydroxyl alcohols having the structure of 1,3-diol react with boric acid. Temperature dependence of the chemical shift of the signals shows that the product is a so-called monodiol type but not a didiol type which is inconsistent with conventional concept of PVA and boric acid reaction.
- 大阪城南女子短期大学の論文
- 1987-12-30