Monday, December 23, 2013

Polymer

1 A polymer is a large molecule (macromolecule) unruffled of retell structural units. These subunits be typically connected by covalent chemical bonds. Although the termpolymer is sometimes taken to refer to plastics, it very encompasses a large class comprising both pictorial and moving picture materials with a wide admixture of properties. Because of the extraordinary range of properties of polymeric materials,[2] they play an essential and ubiquitous role in careless life.[3] This role ranges from old(prenominal) synthetic plastics and elastomers to natural biopolymers such as nucleic acids and proteins that are essential for life. Natural polymeric materials such as shellac, amber, and natural rubber have been used for centuries. A variety of other(a) natural polymers exist, such as cellulose, which is the main grammatical share of wood and paper. The list of synthetic polymers includes synthetic rubber, Bakelite, neoprene, nylon , PVC, polystyrene, polyethylene, polypropylene,polyacrylonitrile, PVB, silicone, and many more. to the highest compass point commonly, the continuously linked backbone of a polymer used for the readiness of plastics consists mainly of carbon atoms. A simple example is polyethylene, whose repeat unit is based on ethylene monomer.
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However, other structures do exist; for example, elements such as silicon form old(prenominal) materials such as silicones, examples beingSilly Putty and waterproof plumbing sealant. group O is also commonly present in polymer backbones, such as those of polyethylene g lycol, polysaccharides (in glycosidic bon! ds), and DNA (in phosphodiester bonds). Polymers are studied in the content of polymer chemistry, polymer physics, and polymer science. Etymology The word polymer is derived from the Greek words ????- - poly-  heart many; and ????? - meros  message part. The term was coined in 1833 by Jöns Jacob Berzelius, although his translation of a polymer was quite different from the modern definition. [edit]Historical development From...If you desire to astonish a full essay, order it on our website: OrderCustomPaper.com

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