Polymer

1 A polymer is a large molecule (macromolecule) composed of retell structural units. These subunits be typically connected by covalent chemical bonds. Although the termpolymer is sometimes taken to refer to plastics, it real encompasses a large class comprising both indispensable and flick 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 pro forma 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 early(a) natural polymers exist, such as cellulose, which is the main grammatical chemical element 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 peak commonly, the continuously linked backbone of a polymer used for the cookery of plastics consists mainly of carbon atoms. A simple example is polyethylene, whose retell unit is based on ethylene monomer.

However, other structures do exist; for example, elements such as silicon form beaten(prenominal) materials such as silicones, examples beingSilly Putty and waterproof plumbing sealant. oxygen is also commonly present in polymer backbones, such as those of polyethylene glyc ol, polysaccharides (in glycosidic bonds)! , and DNA (in phosphodiester bonds). Polymers are studied in the field of force of polymer chemistry, polymer physics, and polymer science. Etymology The word polymer is derived from the Greek words ????- - poly-  heart many; and ????? - meros  moment part. The term was coined in 1833 by Jöns Jacob Berzelius, although his definition of a polymer was quite different from the modern definition. [edit]Historical development From...If you motivation to astonish a full essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper