Bulletproof vests

Kevlar fibers are very strong which makes Kevlar a popular choice m applications where the ratio of strength to weight is important For example a cable made from Kevlar weighs only one fifth as much as a steel one but is just as strong Kevlar is also used to make lightweight bulletproof vests... 

Bulk separations Bulk sweeteners Bulk viscosity Bulletproof vests Bullet-resistant glass Bullets... 

Kevlar, a nylon polymer prepared by reaction of 1,4-benzenedicarboxylic acid (terephthalicacid) with 1,4-benzenediamine (p-phenyienediamine), is so strong that it s used to make bulletproof vests. Draw the structure of a segment of Kevlar. 

Write the formulas of (a) the monomers of Kevlar, a strong fiber used to make bulletproof vests ... 

Bulletproof Vests, First Defense International, http //www.firstdefense.com/html/bulletproof vests.htm... 

The personal security of our citizens also benefits directly from science and technology. Our police forces are equipped with light, strong bulletproof vests made of modem synthetic materials, and fire rescue personnel wear protective clothing made from temperature-resistant polymers. The smoke detectors and carbon monoxide detectors in our homes are based on chemical processes that detect dangerous substances. Personal security is enhanced in the broadest sense by water purification and by the chemical testing procedures that assure us of clean water and food. 

When she first synthesized KEVLAR , Stephanie Kwolek did not know that it would eventually be used in bulletproof vests or protective gloves. She did, however, understand the theories behind the properties that make it suitable for such applications—the theories of intermolecular and intramolecular forces. This is not always the case. Often scientists discover a material that has useful or interesting properties, but are unable to explain them. 

Most of the so-called bulletproof vests were made of polycarbonates. More recently, layers of PE were found to have similar stopping power for a lesser weight of material. 

U.S. market is about 20 million pounds per year. The applications are those where one needs very high flame resistance (clothing for firefighters and welders, welder s protective shield, upholstery and drapes), heat resistance (ironing board covers, insulation film for electrical motors and transformers, aerospace and military), dimensional stability (fire hose, V- and conveyor belts), or strength and modulus (circuit boards, bulletproof vests, fiber optic and power lines, ship mooring ropes, automobile tire cord, puncture-resistant bicycle tires). 

The Law Enforcement Officers Protection Act is passed. It bans the manufacture or importation of so-called cop-killer bullets that can pierce officers bulletproof vests. 

The Magic Bullet versus the Bulletproof Vest Penicillin and j8-Lactamase... 

Polyaramid is a term applied to polyamides containing aromatic groups. These polymers were originally made for use as tire cords but have since found many other uses, a. Kevlar is used in bulletproof vests and many high-strength composites. The structure of Kevlar is... 

Dyneema, the strongest fabric known, is made of ultra high-density polyethylene, and is used for ropes, nets, bulletproof vests, and crash helmets. 

By 1991, experiments with buckyballs led to long strings of the molecules that are tube- or straw-like and are called buckytubes or nanotubes. Many scientists think nanotubes are a fundamental unit for building countless other nanodevices. Nanotubes can be flexed and woven and are being woven into experimental fibers for use in ultralight, bulletproof vests, as one example. Nanotubes are also perfect conductors, and they may be used to construct atomically precise electronic circuitry for more advanced computers and flat panel displays. 

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