News tagged with plastic

Related topics: brain , neurons , synapses

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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A close look at blinking after facial transplantation

Recovery of blinking function is a critical but easily overlooked outcome after facial transplantation, according to a report in the January issue of Plastic and Reconstructive Surgery, the official medical journal of the Americ ...

Dec 29, 2014
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Smartphone thumb skills alter our brains

When people spend time interacting with their smartphones via touchscreen, it actually changes the way their thumbs and brains work together, according to a report in the Cell Press journal Current Biology on Dec ...

Dec 23, 2014
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Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic amorphous solid materials suitable for the manufacture of industrial products. Plastics are typically polymers of high molecular weight, and may contain other substances to improve performance and/or reduce costs.

The word derives from the Greek πλαστικός (plastikos) meaning fit for molding, and πλαστός (plastos) meaning molded. It refers to their malleability, or plasticity during manufacture, that allows them to be cast, pressed, or extruded into an enormous 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, for instance, is plastic in this sense, but not a plastic in the common sense; while some plastics, in their finished forms, will break before deforming and therefore are not plastic in the technical sense.

There are two types of plastics: thermoplastics and thermosets. Thermoplastics, if exposed to enough heat, will melt. Thermosets will keep their shape until they are charred and burnt. Some examples of thermoplastics are grocery bags, piano keys and some automobile parts. Examples of thermosets are children's dinner sets and circuit boards.

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