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- A similar fiber called [[Twaron]] with roughly the same chemical structure was introduced by [[Akzo]] in 1978, and ...er|566px|The reaction of 1,4-phenylene-diamine (''para''-phenylenediamine) with terephthaloyl chloride yielding kevlar.]]14 KB (1,990 words) - 10:16, 20 September 2010
