Kevlar Aramid Fiber :: essays research papers

STRUCTUREKevlar Aramid Fiber is a synthetic (man-make) physical cognise as a Polymer. A polymer is a chain that is do up of many similar molecular groups, better known as monomers that ar bonded together. Monomers are made up of fourteen Carbon atoms, two Nitrogen atoms, two Oxygen atoms and ten Hydrogen atoms. A wizard Kevlar polymer chain could possibly have anywhere from one to five trillion monomers bonded together.A group of polymer chains can be organised together in a fiber. How the polymer chains are put together is important, as it improves the properties of the material. The flexibility, strength and roughness of Kevlar fiber, is dependent on the orientation of the polymer chains. Kevlar fiber is an show of molecules, orientated parallel to each other. This orderly, untangled arrangement of molecules is described as a Crystalline Structure. A manufacturing process known as Spinning is needed to achieve this Crystallinity structure. Spinning is a process that invo lves forcing the melted polymer solution through a die (small holes). The Crystallinity of Kevlar Polymer strands, contributes to the unique strength and stiffness of the material. Kevlar is very similar to other common synthetic polymers, including Nylon, Teflon and Lycra. In all Polated to strength. Aromatic refers to the Carbon atoms attached in a ring, and Amides refers to a group of Carbon, Nitrogen and Hydrogen atoms. Kevlar fiber is therefore a Polyaromatic amide, as it has a high breaking strength.Polymer chains are long, individual chains, although they playact as if they are attached to each other. The individual chains are actually held together by Electrostatic Forces between molecules, excessively known as Hydrogen Bonds. Scientists discovered this, by using a finical type of X-ray microscopy called XANES. This was able to reveal the orientation of molecules in materials. It has also been discovered that the components of Kevlar fiber, have a radial orientation that is in a crystal. The crystal-like regularity is the largest contributing factor in the strength of Kevlar fiber. PROPERTIESIt is five time stronger, yet the same weight as steel. Kevlar Aramid fiber is an improved material, which is an extremely lightweight, man-made organic fiber. Kevlar fiber has a combination of properties, which have made Kevlar a very useful material. These include, high strength, low weight, high chemic resistance and high cut resistance. This material does not corrode or rust and is also unaffected when placed in or under(a) water.