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Polymers
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Polymers
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A polymer is a substance composed of molecules with large molecular mass composed of repeating structural units, or monomers, connected by covalent chemical bonds. The term is derived from the Greek words: polys meaning many, and meros meaning parts. The individual molecules which comprise a polymer are referred to as polymer molecules, where the word "polymer" functions as an adjective. Well known examples of polymers include plastics and DNA. While the term polymer in popular usage suggests "plastic", polymers comprise a large class of natural and synthetic materials with a variety of properties and purposes. Natural polymer materials such as shellac and amber have been in use for centuries. Paper is manufactured from cellulose, a naturally occurring polysaccharide found in plants. Biopolymers such as proteins and nucleic acids play important roles in biological processes. The term polymer was coined in 1833, around the same time as Henri Braconnot's pioneering work in derivative cellulose compounds, perhaps the earliest important work in polymer science. The development of vulcanization later in the nineteenth century improved the durability of the natural polymer rubber, signifying the first popularized semi-synthetic polymer. The first wholly synthetic polymer, Bakelite, was introduced in 1909.
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Wed, 31 Dec 2008 18:52:00 GMT
SAN CARLOS, Calif., Dec. 31 /PRNewswire-FirstCall/ -- Nektar Therapeutics (NASDAQ: NKTR) today announced that it has successfully closed the divestiture of specific Nektar pulmonary delivery assets, technology, and intellectual property to Novartis ...
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Drug testing breakthrough in polymer research - Thetech Herald
Mon, 29 Dec 2008 21:47:00 GMT
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Aussie scientist in polymer breakthrough - West Online
Mon, 29 Dec 2008 21:39:00 GMT
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Mon, 29 Dec 2008 16:10:00 GMT
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