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Essay on Protecting Those at War: The Bulletproof Vest

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At this very moment armed forces are fighting for our freedom overseas. These brave soldiers go out everyday risking their lives for us. This is not a safe job numerous incidents bring these people to harm, but there is a way that chemistry has helped protect those at war. This is by the invention of the bulletproof vest. This vest can stop bullets from entering someone’s body with only leaving bruises behind. Somewhere else in the world a fire is burning down a house with people inside. Firefighters will be called to put out the fire and help these innocent people. The equipment they wear helps protect them from serious burns and injuries allowing them to do their job. The bulletproof vest and firefighters uniform cannot be made unless …show more content…

The flak jacket provided protection primarily from ammunitions fragments and was ineffective against most pistol and rifle threats. Flak jackets were also very bulky. Bulletproof vests have come a long way since their silk and flak days. Developed at DuPont in 1965, the high strength material was first commercially used in the early 1970s as a replacement for steel in racing tires. In the late 1970s it was discovered that Kevlar would make a good material for body armor. Kevlar soon became manufactured. Kevlar soon became used in body armor all over the world and is still seen being used today.
Kevlar is constructed of manmade fibers known as aramids. It belongs to a class of polymers. The polymers work just like gauze, but at a microscopic level. The basic unit of a polymer is a chain. Each one of the chains is made of millions of “monomers” that are linked to each other by chemical bonds. The monomers are long and rod-like. With Kevlar, the monomers link with there own chains and cross-link to monomers in other chains. The more Kevlar cross-links, the harder it becomes to separate the chains from each other. The cross-linking between intermolecular and intramolecular molecules is what gives Kevlar the strength five times that of steel with a flexible strength-to-weight ratio. Typically Kevlar is spun into ropes or fabric sheets that can be used as an ingredient in the composite material components. When you make a thick layer of Kevlar, it is able to

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