Studies on the Molecular Orientation in Acrylic Fibers

DOI

Bibliographic Information

Other Title
  • アクリル繊維の配向に関する研究
  • IV. Effect of the Degree of Orientation to Fiber Properties
  • 第4報配向度の糸質への影響

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Description

Effects of the orientation function on the fiber properties at room temperature (particularly, effects on stress-strain curve) have been studied on acrylic fibers, of which orientation functions were changed by changing draw and heat treatments. Young's modulus (E), yield stress, second stiffness and tenacity are not directly respondent to the orientation function of crystallite (FX) but respondent to the orientation functions of CN group (FCN), CO group (FCO) and Congored (FCR) with linear or curvesome (positive curvature) relations. Therefore, fiber properties are considered to vary according to transformation mechanism of chain molecules in amorphous region.<BR>Shear modulus (G) does not change even if the orientation function (F) is widely changed, and its value is one third Young's modulus (Eiso) when the orientation function is extrapolated to zero. This G value agrees with theoretical value and shows the same trend found in the cases of Nylon 66 and Dacron.<BR>Relation between Young's modulus (E) and the orientation function (F) is well expressed by Moseley equation. E=Eiso/(1-αF), α≈1 (or a constant deviated slightly from 1 depending on treatment condition and kind of F).<BR>Relation between second stiffness (E') and F shows curves similar to the relation between tension and F which is derived from rubber elasticity theory. So, we believe E' of acrylic fibers substantially depends upon chain deforming mechanism such as in rubber. Elongation at break is in reverse proportion to F, and tenacity is almost constant at a given F even if the conditions of draw or heat treatment are changed. Relation between the knot strength and F can not be simply expressed, because the knot strength is determined by a balance of strength and elongation.

Journal

  • Kobunshi Kagaku

    Kobunshi Kagaku 23 (253), 295-302, 1966

    The Society of Polymer Science, Japan

Details 詳細情報について

  • CRID
    1390001206520301056
  • NII Article ID
    130004032603
  • DOI
    10.1295/koron1944.23.295
  • ISSN
    18848079
    00232556
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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