Kevlar is synthesized in solution from the monomers 1,4-phenylene-diamine (para-phenylenediamine) and terephthaloyl chloride in a condensation reaction yielding hydrochloric acid as a byproduct. The result has liquid-crystalline behavior, and mechanical drawing orients the polymer chains in the fiber's direction. Hexamethylphosphoramide (HMPA) was the solvent initially used for the polymerization, but for safety reasons, DuPont replaced it by a solution of N-methyl-pyrrolidone and calcium chloride. As this process had been patented by Akzo (see above) in the production of Twaron, a patent war ensued.How Kevlar® works: a simple introduction. Explainthatstuff.com (2009-12-07). Retrieved on 2012-05-26.
kevlar is synthesized in solution from the monomers 14-phenylene-diamine (para-phenylenediamine) and terephthaloyl chloride in a condensation reaction yielding hydrochloric acid as a byproduct the result has liquid-crystalline behavior and mechanical drawing orients the polymer chains in the fiber's direction hexamethylphosphoramide (hmpa) was the solvent initially used for the polymerization but for safety reasons dupont replaced it by a solution of n-methyl-pyrrolidone and calcium chloride as this process had been patented by akzo (see above) in the production of twaron a patent war ensuedhow kevlar® works a simple introduction explainthatstuffcom (2009-12-07) retrieved on 2012-05-26