ポリビニルアルコール繊維の内部構造の力学的性質に与える影響

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タイトル別名
  • EFFECT OF FINE STRUCTURES ON MECHANICAL PROPERTIES OF POLYVINYL ALCOHOL FIBERS
  • ポリビニルアルコール センイ ノ ナイブ コウゾウ ノ リキガクテキ セイシツ ニ アタエル エイキョウ 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 4

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The relation between the fine structures and mechanical properties was investigated on polyvinyl alcohol fibers spun in coagulating baths of Na2SO4 (G) or NaOH (C), followed by hotdrawing and relaxation heat treatment.<br>Three mechanical loss peaks are observed around 20°C, 70°C and 120°C, which are known as βa, αa and βc absorptions, respectively. The intensities of these absorptions decrease with draw ratio, and increase with shrinkage ratio. The αa absorption is attributed to the microbrownian motion of amorphous chains and disappears when the amorphous orientation function Fa is extrapolated to 1. The fine structures of fiber G and fiber C are reflected on the relation between the peak intensity of αa absorption and Fa. The βc absorption is considered to be attributed to the low ordered amorphous region. Dynamic modulus E' increases and the lowering of E' by heating becomes smaller with the increase in the total orientation function Ft. Highly drawn fibers have higher Young's modulus, while highly relaxed fibers have lower modulus. Young's modulus is reasonably explained using a series model of crystalline and amorphous regions. The breaking strength and elongation are remarkably affected by the state of amorphous regions. The breaking strength and elongation strongly depend on Fa. Very high hot-drawing was possible for fiber C than fiber G. This is because for the high molecular orientation and the high modulus, high strength and low elongation.<br>The behaviours for the knot strength were different between fiber G and fiber C, reflecting the difference of the structures of amorphous region. It should be considered that the knot strength is related to other factors such as the length of amorphous region, in addition to Fa.

収録刊行物

  • 繊維学会誌

    繊維学会誌 29 (5), T197-T204, 1973

    社団法人 繊維学会

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