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Kevlar - Online Paper

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. is a combination of high strength, high modulus (resistance to extension), toughness and thermal stability. 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 ...

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orientation on the benzene ring, which allowed for rod-like molecular structures. This technology was used when Du Pont released aramid fiber in 1971.
What is it?
Kevlar is an aramid, a term invented as an abbreviation for aromatic polyamide. The chemical composition of Kevlar is poly para-phenyleneterephthalamide, and it is more properly known as a para-aramid. Aramids belong to the family of nylons. Common nylons, such as nylon 6, do not have very good structural properties, so the para-aramid distinction is important. The aramid ring gives Kevlar thermal stability, while the para structure gives it high strength and modulus. Like nylons, Kevlar filaments are made by extruding the precursor through a spinneret. The rod form of the para-aramid molecules and the extrusion process make Kevlar fibers anisotropic--they are stronger and stiffer in the axial direction than in the transverse direction. In comparison, graphite fibers are also anisotropic, but glass fibers are ...

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Kevlar. (2004, February 11). Retrieved November 30, 2024, from http://www.essayworld.com/essays/Kevlar/2877

"Kevlar." Essayworld.com. Essayworld.com, 11 Feb. 2004. Web. 30 Nov. 2024. <http://www.essayworld.com/essays/Kevlar/2877>

"Kevlar." Essayworld.com. February 11, 2004. Accessed November 30, 2024. http://www.essayworld.com/essays/Kevlar/2877.

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PAPER DETAILS

Added: 2/11/2004 12:19:27 AM
Category: Science & Nature
Type: Premium Paper
Words: 936
Pages: 4

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