Information About

Aramid




A well-known type of aramid fiber (a Para -aramid Nylon ) is commonly known by its DuPont trade name, Kevlar , or Teijin trade name Twaron. It was developed by Stephanie Kwolek . An especially Fire proof Meta variant is Nomex .


ARAMID FIBER CHARACTERISTICS


  • sensitive to degradation from Ultraviolet Radiation

  • good resistance to Abrasion , organic solvents, and thermal degradation

  • sensitive to moisture and salts

  • nonconductive

  • no Melting Point

  • low flammability

  • good fabric integrity at elevated Temperature s

  • para-aramid fibers such as Kevlar and Twaron, which have a slightly different Molecular structure, also provide outstanding strength-to-weight properties, and have high Tenacity , and high Young's Modulus .



MAJOR INDUSTRIAL USES




PRODUCTION


The Federal Trade Commission definition for Aramid fiber is "A manufactured fiber in which the fiber-forming substance is a long-chain synthetic polyamide in which at least 85% of the Amide Linkages are attached directly to two aromatic rings."

Aramid fiber is produced by Spinning a Solid fiber from a Liquid chemical blend. This relies on a co-solvent with an Ionic component ( Calcium Chloride ) to occupy the Hydrogen Bond s of the ''amide'' groups, and an organic solvent ( N-methyl Pyrrolinidone ) to dissolve the Aromatic Polymer ; prior to DuPont's (Kwolek's) invention of this process, no practical means of dissolving the polymer was known.

First U.S. Commercial Aramid Fiber Production: 1961, DuPont Company.

Current U.S. Aramid Fiber Producers: INVISTA


SEE ALSO