Also, these rigid molecules will even arrange in solutions. Such solutions are called liquid crystalline, which underscores their good organization. Poly-paraphenylene terephthalamide molecules behave like uncooked spaghetti, whereas other, less rigid molecules behave more like cooked strands of spaghetti.
Thus, the nature of the molecule makes it easier to achieve the desired aligned structure. In addition, poly-paraphenylene terephthalamide strongly resists high temperatures and flames. Offering strength under heat, Kevlar protects against thermal hazards up to degrees Farenheit. This combination of unusual properties makes Kevlar useful for a broad range of applications, such as ballistic vests, cut-resistant gloves and blast and flame barriers. Kevlar has also boosted sports gear performance.
Applications in that vein include bicycle tires that are virtually flat-free and puncture-resistant; running shoes that maximize the energy output of runners; boats that are lighter and more damage-tolerant; and durable lightweight sails that tolerate high winds and saltwater. Even the watersports industry has found uses to it. The tenacity it has makes the fiber perfect for boat sails, competition sailboats or downhill kayaks.
Having a safe but low weight suit can be a life saver. This way cuts and breaks are not a problem anymore. It has also been used as part of the landing system of the Mars Pathfinder , the ship that has been exploring the Surface of the red planet for years.
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It is mandatory to procure user consent prior to running these cookies on your website. Posted on 19 June, 11 September, Posted in Textile. These materials have even greater strength against ballistics, and the material can be layered and configured as desired to enhance its protective qualities, weight, or flexibility.
Kevlar cannot be easily cut or punctured, due to the chain links that form the fibers of this material. That means even more protection for police and military applications. In addition, it makes Kevlar the ideal material for a variety of gloves, where workers handle sharp objects. This chemical is made from creating a chemical reaction between an acid and a chemical solution containing nitrogen and hydrogen. This process results in chemical chains composed of hydrogen, carbon, oxygen, and nitrogen.
These chains are incredibly strong on their own. The spinning process orients all of the chains to be parallel, while enabling the hydrogen bonds on the sides of the chain to act as a glue, keeping the chains together. As such, the chains are incredibly strong in tensile strength along the length of the chain, and the hydrogen bonds form incredible tensile strength perpendicular to the orientation of the chains.
Most Kevlar vests are rated for a service life of 5 years. The mechanical properties of different grades are given in the table below:.
The structure of Kevlar has unique kinks bands responsible for the compression buckling of molecules and hence they behave elastically in tension.
In compression, they yield at 0. The generic properties of these fibers are:. The exceptional and unique properties of fiber enable them to apply in a variety of applications. These applications range from premium sports goods and deep-sea umbilical lines and to high-performance structural composites in aircraft components, boat hulls, and high-performance cars.
The high tenacity and thermally stable fibers are used for lightweight bulletproof body armor, and also due to weight-saving it can also replace heavier materials in airplanes, for fuel saving. In tennis strings, high durability is considered a primary factor for consideration. In fast racing cars and bikes, excessive friction on tires causes burning and overheating.
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