Development of High Strengh and High Modulus Para-Aramid Fiber

DOI Web Site

Bibliographic Information

Other Title
  • 高強力・高弾性アラミド繊維の開発

Search this article

Description

The present paper relates the study and development of high strength and high modulus aramid fiber, Technora. In general, aramid polymers composed of wholly aromatic polyamide present a good heat resistance. Particularly, para-type aramid polymers have rigid molecular skeletons which enhance the strength and modulus of polymer chain. However, it is not easy to shape these para-aramid polymers as a melt or to solve them in organic solvents. Therefore, the fiber formation technique becomes quite difficult. Our basic idea was to modify the rigid molecule to be soluble in an organic solvent. The first key technology was the introduction of a slightly flexible element into the rigid molecular structure. The second innovation was to improve the fiber strength by high temperature drawing. In principle, the chemical modification of this kind was not simple, because the flexible element often spoiled the rigid polymer structure. Various polymers were studied to meet the incompatible requirement. However, the following aramid copolymer showed excellent mechanical properties among others.<BR>0c0C0 N ONH -(COG0H N -0-0-CFHN)n (average of in) / (average of n) = 50 / 50<BR>In this molecular structure the meta-bonded ether plays an important role. It increases the solubility to organic solvents and yet preserves the rigid linearity of polymer chain. The polymerization condition and spinning and drawing conditions were o ptimized. In particular, the development of a novel drawing process was successful in the elevation of fiber strength. The drawing temperature was extremely high over 500 °C, which was not common for organic fiber productions. The obtained fiber strength was 3.4 GPa. This value is the highest among commercialized aramid fibers. Also, the fiber shows a strong resistance against chemicals, abrasion and fatigue.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1992 (3), 237-245, 1992-03-10

    The Chemical Society of Japan

Keywords

Details 詳細情報について

Report a problem

Back to top