1 AÂ polymerÂ is a largeÂ moleculeÂ (macromolecule) unruffled of retellÂ structural units. These subunits be typically connected byÂ covalentÂ chemical bonds. Although the termpolymerÂ is sometimes taken to refer toÂ 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,Â they play an essential and ubiquitous role in careless life.Â This role ranges from old(prenominal) synthetic plastics andÂ elastomersÂ to naturalÂ biopolymersÂ such asÂ nucleic acidsÂ andÂ proteinsÂ that are essential for life. Natural polymeric materialsÂ such asÂ shellac,Â amber, and naturalÂ rubberÂ have been used for centuries. A variety of other(a) natural polymers exist, such asÂ cellulose, which is the main grammatical share of wood and paper. TheÂ list of synthetic polymersÂ includesÂ synthetic rubber,Â Bakelite,Â neoprene,Â nylon ,Â PVC,Â polystyrene,Â polyethylene,Â polypropylene,polyacrylonitrile,Â PVB,Â 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 ofÂ carbonÂ atoms. A simple example is polyethylene, whose repeat unit is based onÂ ethyleneÂ monomer.
However, other structures do exist; for example, elements such asÂ siliconÂ form old(prenominal) materials such as silicones, examples beingSilly PuttyÂ and waterproof plumbing sealant. group O is also commonly present in polymer backbones, such as those ofÂ polyethylene g lycol,Â polysaccharidesÂ (inÂ glycosidic bon! ds), andÂ DNAÂ (inÂ phosphodiester bonds). Polymers are studied in the content ofÂ polymer chemistry,Â polymer physics, andÂ polymer science. Etymology The wordÂ polymerÂ is derived from the Greek wordsÂ ????- - poly-Â heart many; andÂ ????? - merosÂ message part. The term was coined in 1833 byÂ JÃ¶ns Jacob Berzelius, althoughÂ his translationÂ of a polymer was quite different from the modern definition. Historical development From...If you desire to astonish a full essay, order it on our website: OrderCustomPaper.com
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