The History of Kevlar Kevlar is an organic fiber in the aromatic polyamide family. It has unique properties and a chemical composition that is its own, which distinguishes it from other man-made fibers. Kevlar is a combination of high strength, high modulus (resistance to extension), toughness and thermal stability. Kevlar has a wide range of uses. In the 1960s nylon and polyester opened the door for man-made fibers. They were cutting edge fibers in their time but to achieve maximum break strength and initial modulus, the polymer molecules needed to be in an extended-chain configuration and almost perfect crystalline packing. With flexible-chain molecules, such as nylon or polyester, this could only be done by mechanically drawn in after spinning. This required chain disentanglement and orientation in the solid phase of it. Therefore the strength and modulus levels were far lower than t....

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Number Of Words: 956

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