In aramids these rings are connected via amide linkages each comprising a CO group attached to an NH group. Īromatic in the name refers to the presence of aromatic rings of six carbon atoms. The term was introduced in 1972, accepted in 1974 by the Federal Trade Commission of the USA as the name of a generic category of fiber distinct from nylon, and adopted by the International Standards Organisation in 1977. The attachment points on each ring are diametrically opposite each other, meaning this is classed as a para-aramid.Īramid is a shortened form of aromatic polyamide.

The rings are attached alternately to either two NH groups or two CO groups. Terminology and chemical structure Structure of Twaron and Kevlar. Aramids have a very high melting point (>500 ☌ (932 ☏)).Ĭommon aramid brand names include Kevlar, Nomex, and Twaron.

As a result, a higher proportion of the chemical bond contributes more to fiber strength than in many other synthetic fibers. The chain molecules in the fibers are highly oriented along the fiber axis. They are used in aerospace and military applications, for ballistic-rated body armor fabric and ballistic composites, in marine cordage, marine hull reinforcement, as an asbestos substitute, and in various lightweight consumer items ranging from phone cases to tennis rackets. Aramid fibers, short for aromatic polyamide, are a class of heat-resistant and strong synthetic fibers.

Poly meta meaning