Polymer
hideA polymer (from Greek πολύ-ς /po΄li-s/ much, many and μέρος /΄meros/ part) is a large molecule (macromolecule) composed of repeating structural units typically connected by covalent chemical bonds. While polymer in popular usage suggests plastic, the term actually refers to a large class of natural and synthetic materials with a variety of properties.
Due to the extraordinary range of properties accessible in polymeric materials , they have come to play an essential and ubiquitous role in everyday life - from plastics and elastomers on the one hand to natural biopolymers such as DNA and proteins that are essential for life on the other. A simple example is polyethylene, whose repeating unit is based on ethylene (IUPAC name ethene) monomer. Most commonly, as in this example, the continuously linked backbone of a polymer consists mainly of carbon atoms. However, other structures do exist; for example, elements such as silicon form familiar materials such as silicones, examples being silly putty and waterproof plumbing sealant. The backbone of DNA is in fact based on a phosphodiester bond, and repeating units of polysaccharides (e.g. cellulose) are joined together by glycosidic bonds via oxygen atoms.
Natural polymeric materials such as shellac, amber, and natural rubber have been in use for centuries. Biopolymers such as proteins and nucleic acids play crucial roles in biological processes. A variety of other natural polymers exist, such as cellulose, which is the main constituent of wood and paper.
The list of synthetic polymers includes synthetic rubber, Bakelite, neoprene, nylon, PVC, polystyrene, polyacrylonitrile, PVB, silicone, and many more.
Polymers are studied in the fields of polymer chemistry, polymer physics, and polymer science.
For more information about Polymer, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with polymer
Bioengineers succeed in producing plastic without the use of fossil fuels
Nov 23, 2009 |
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A team of pioneering South Korean scientists have succeeded in producing the polymers used for everyday plastics through bioengineering, rather than through the use of fossil fuel based chemicals. This groundbreaking research, ...
Two-In-One Punch Knocks Out Drug Resistant Cancer Cells
Nanotechnology / Bio & Medicine
Nov 04, 2009 |
5 / 5 (4) |
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(PhysOrg.com) -- Cancer cells, like bacteria, can develop resistance to drug therapy, leading to relapse of disease. One approach showing promise in overcoming multidrug resistance in tumors is to combine two different anticancer ...
Smart drug delivery system -- Gold nanocage covered with polymer (w/ Video)
Nov 01, 2009 |
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In campy old movies, Lucretia Borgia swans around emptying powder from her ring into wine glasses carelessly left unattended. The poison ring is usually a confection of gold filigree holding a cabochon or ...
A Tiny Cage of Gold Responds to Light, Opening to Empty Its Contents
Nanotechnology / Bio & Medicine
Nov 19, 2009 |
5 / 5 (3) |
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(PhysOrg.com) -- Researchers at Washington University in St. Louis have developed a polymer-coated gold nanocage that not only opens in response to light to release a small amount of a drug payload, but then closes when the ...
Scientists synthesize graphene-like material: Polymer with honeycomb structure
Nanotechnology / Nanomaterials
Nov 19, 2009 |
4.4 / 5 (12) |
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Two-dimensional carbon layers, so-called graphenes, are regarded as a possible substitute for silicon in the semiconductor industry. The electronic properties of these layers can be varied by "building in" ...
One word: bioplastics
Nov 17, 2009 |
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(PhysOrg.com) -- Every year, more than 250 billion pounds of plastic are produced worldwide. Much of it ends up in the world's oceans, a fact that troubles MIT biology professor Anthony Sinskey.
Tiny particles can deliver antioxidant enzyme to injured heart cells
Nov 16, 2009 |
5 / 5 (1) |
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Researchers at Emory University and the Georgia Institute of Technology have developed microscopic polymer beads that can deliver an antioxidant enzyme made naturally by the body into the heart.
Yeast in a shell: Coating individual living yeast cells with silicon dioxide
Nov 03, 2009 |
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(PhysOrg.com) -- Our breakfast egg is a peculiarity of nature: a single cell protected by a thin mineral layer. Apart from a number of tiny radiolaria and diatoms, individual cells normally do not have a hard shell. Korean ...
Sweet -- sugared polymer a new weapon against allergies and asthma
Nov 19, 2009 |
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Scientists at Johns Hopkins and their colleagues have developed sugar-coated polymer strands that selectively kill off cells involved in triggering aggressive allergy and asthma attacks. Their advance is a significant step ...
Toshiba develops molecular photoresist technology for EUV lithography
Nov 17, 2009 |
2.2 / 5 (13) |
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Toshiba Corporation today announced that it has developed a high resolution photoresist (photo-sensitive film) essential for future application of EUV (extreme ultraviolet) lithography in semiconductor fabrication, ...
