Polymer

1 A polymer is a large molecule (macromolecule) hive away of retell structural units. These subunits ar typically connected by covalent chemical bonds. Although the termpolymer is sometimes taken to refer to plastics, it real encompasses a large class comprising both inseparable and plastic film 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 passing(prenominal) 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 former(a) natural polymers exist, such as cellulose, which is the main grammatical fate of wood and paper. The list of synthetic polymers includes synthetic rubber, Bakelite, neopre ne, nylon, PVC, polystyrene, polyethylene, polypropylene,polyacrylonitrile, PVB, silicone, and many more. to the highest percentage point commonly, the continuously linked backbone of a polymer used for the training of plastics consists mainly of carbon atoms. A simple example is polyethylene, whose tell unit is based on ethylene monomer.

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

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