News tagged with plastics

Google Glass shows promising uses in plastic surgery

The "wearable technology" Google Glass has a wide range of possible applications in plastic surgery—with the potential to enhance surgical training, medical documentation, and patient safety, according to a special paper ...

Mar 02, 2015
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Doctors nonsurgically correct infant ear deformities

A team of researchers from Weill Cornell Medical College and NewYork-Presbyterian/Weill Cornell Medical Center has improved a nonsurgical procedure that safely and effectively corrects newborn ear deformities ...

Mar 02, 2015
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Good results with surgery for gynecomastia in bodybuilders

With attention to some unique patient characteristics, breast reduction surgery achieves good aesthetic outcomes in bodybuilders with gynecomastia—enlargement of the male breast, according to a report in the February issue ...

Jan 28, 2015
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Study warns about bisphenol A substitutes

Two substitutes for bisphenol A, a plastic ingredient banned in some countries over health fears, are also a source of concern, French researchers warned Thursday.

Jan 15, 2015
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Plastic

A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce production costs. Monomers of plastic are either natural or synthetic organic compounds.

The word plastic is derived from the Greek πλαστικός (plastikos) meaning capable of being shaped or molded, from πλαστός (plastos) meaning molded. It refers to their malleability, or plasticity during manufacture, that allows them to be cast, pressed, or extruded into a variety of shapes—such as films, fibers, plates, tubes, bottles, boxes, and much more.

The common word plastic should not be confused with the technical adjective plastic, which is applied to any material which undergoes a permanent change of shape (plastic deformation) when strained beyond a certain point. Aluminum which is stamped or forged, for instance, exhibits plasticity in this sense, but is not plastic in the common sense; in contrast, in their finished forms, some plastics will break before deforming and therefore are not plastic in the technical sense.

There are two types of plastics: thermoplastics and thermosetting polymers. Thermoplastics are the plastics that do not undergo chemical change in their composition when heated and can be moulded again and again; examples are polyethylene, polypropylene, polystyrene, polyvinyl chloride and polytetrafluoroethylene (PTFE). Thermosets can melt and take shape once; after they have solidified, they stay solid.

The raw materials needed to make most plastics come from petroleum and natural gas.

This text uses material from Wikipedia licensed under CC BY-SA