News tagged with plastic

Related topics: brain , neurons , synapses

Cranial irradiation causes brain degeneration

(Medical Xpress)—Cranial irradiation saves the lives of brain cancer patients. It slows cancer progression and increases survival rates. Unfortunately, patients who undergo cranial irradiation often develop ...

Jul 16, 2013
popularity 4.9 / 5 (16) | comments 4 | with audio podcast report

Brain structure adapts to environmental change

Scientists have known for years that neurogenesis takes place throughout adulthood in the hippocampus of the mammalian brain. Now Columbia researchers have found that under stressful conditions, neural stem cells in the adult ...

Jun 13, 2011
popularity 4.7 / 5 (7) | comments 0 | with audio podcast

The biology behind alcohol-induced blackouts

(Medical Xpress) -- A person who drinks too much alcohol may be able to perform complicated tasks, such as dancing, carrying on a conversation or even driving a car, but later have no memory of those escapades. ...

Jul 07, 2011
popularity 5 / 5 (6) | comments 1 | with audio podcast

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