Aromatic Polyamide-Rigid Rod Kevlar Poly p-Phenylene Terephthalamide Fibers

3 Aromatic Polyamide-Rigid Rod Kevlar Poly(p-Phenylene Terephthalamide) Fibers 

Nomex (a DuPont registered trademark for aromatic polyamide fibers) was available in early 1960s and became breakthrough 

Kevlar is a carbon based aramid polymer, which is similar in structure to nylons. When nylons are at high concentration in solution their flexible chains become highly entangled. Due to this entanglement when the solution is spun it produces only moderately extended chains negatively affecting the fiber properties. 

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