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Kevlar (para-aramid) [2] is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora.Developed by Stephanie Kwolek at DuPont in 1965, [3] [2] [4] the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
Ballistic nylon (until the 1970s) or Kevlar, Twaron [92] or Spectra (a competitor for Kevlar) or polyethylene fiber could be used to manufacture bullet proof vests. The vests of the time were made of ballistic nylon & supplemented by plates of fiber-glass, steel, ceramic, titanium, Doron & composites of ceramic and fiberglass, the last being ...
These polymers can be further classified according to the linkages on the aromatic subunits. Nomex, Teijinconex, and New Star contain predominantly the meta-linkage. They are called poly-metaphenylene isophthalamides (MPIAs). By contrast, Kevlar and Twaron both feature para-linkages. They are called p-phenylene terephthalamides (PPTAs).
Polymer Characteristic properties Uses Bakelite: Phenol-formaldehyde resin: High electric, heat and chemical resistance: Insulation of wires, manufacturing sockets, electrical devices, brake pads, etc. Kevlar: Para-aramid fibre: High tensile strength: Manufacturing armour, sports and musical equipment. Used in the field of cryogenics: Twaron ...
The innovative polymer Poly-p-phenylene terephthalamide, as invented by Kwolek, was released commercially under the name Kevlar. [ 9 ] In 1964, in anticipation of a gasoline shortage, Kwolek's group began searching for a lightweight yet strong fiber to replace the steel used in tires.
In 1966, Stephanie Kwolek, a chemist working for E.I. DuPont de Nemours & Co., developed Kevlar; a strong, lightweight liquid polymer that can be spun into a fiber and woven into cloth. [3] Kevlar was initially used as a replacement for steel-belting in tires, and later for use in ropes, gaskets, and automotive and aviation parts.
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First issued in 1983 to replace the M1 helmet. Former kevlar helmet used by the United States Army, Marine Corps, Navy. Used by the USAF, but is being phased out by the ACH [46] US Air Force. [47] Adopted by the Mexican Armed Forces in the 1990s to replace the M1 helmet. Replaced the M1 helmet of the Argentine army and modified with padded ...