polystyrene


Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.
Related to polystyrene: Polystyrene sulfonate

polystyrene

(pŏl'ēstī`rēn), widely used plasticplastic,
any organic material with the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn. Composition and Types of Plastic
..... Click the link for more information.
; it is a polymerpolymer
, chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds (see chemical bond). The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer,
..... Click the link for more information.
 of styrene. Polystyrene is a colorless, transparent thermoplastic that softens slightly above 100°C; (212°F;) and becomes a viscous liquid at around 185°C; (365°F;). It is resistant to acids, alkalies, oils, and alcohols. It is produced either as a solid or as a foamed plastic marketed under the trade name Styrofoam. Its many uses include electrical and thermal insulation, translucent window panels, storage-battery cases, and toilet articles.

polystyrene

A hard, tough, stable thermoplastic that is easily colored, molded, expanded, or rolled into sheeting. See also: Plexiglas

Polystyrene

 

a linear polymer of styrene, [—CH2— CH(C6H5) —]n; a clear vitreous substance. Moleculer weight, 30,000–500,000; density, 1.06 g/cm3 (20°C); glass transition point, 93°C.

Polystyrene is an inexpensive, large-tonnage thermoplastic resin. It has high hardness and good dielectric properties; it is weatherproof and readily dyeable and moldable. It is chemically stable and soluble in aromatic and chlorinated aliphatic hydrocarbons, and it is physiologically harmless. However, it has relatively low heat resistance (Vicat softening point, about 100°C) and high brittleness; various styrene copolymers have better use properties. For example, copolymerization of styrene with acrylonitrile or α-methylstyrene increases heat resistance and tensile strength by about 60 percent; an increase in strength and impact strength from 5–10 to 50–100 kilojoules per sq m, or kilograms = force · cm per sq cm, is achieved by production of graft styrene copolymers with 5–10 percent rubber—for example, butadiene (impact-resistant polystyrene)—or triple copolymers of acrylonitrile, butadiene, and styrene (ABS polymers). Transparent triple copolymers are synthesized upon substitution of methyl methacrylate for acrylonitrile.

Polystyrene and styrene copolymers are produced in industry by radical polymerization in bulk or in aqueous emulsions; they are processed by injection molding, extrusion, compression molding, and vacuum forming.

Polystyrene is used in the manufacture of household appliances and domestic items, packing material, toys, accessories, and films, as well as in the preparation of polystyrene foam. In addition, impact-resistant polystyrene and ABS polymers are used in the manufacture of radio and television housings, motor vehicle and refrigerator parts, furniture, and pipes. Polystyrene is also mixed with rubber and with other plastics.

World production of polystyrene and styrene copolymers in 1973 was about 5 million tons.

REFERENCES

Houwink, R., and A. Staverman [compilers]. Khimiia i tekhnologiia polimerov, vols. 1–2 (parts 1–2). Moscow-Leningrad, 1965–66. (Translated from German.)
See also references under .

S. A. VOL’FSON

polystyrene

[¦päl·i′stī‚rēn]
(organic chemistry)
(C6H5CHCH2)x A water-white, tough synthetic resin made by polymerization of styrene; soluble in aromatic and chlorinated hydrocarbon solvents; used for injection molding, extrusion or casting for electrical insulation, fabric lamination, and molding of plastic objects.

polystyrene

a synthetic thermoplastic material obtained by polymerizing styrene; used as a white rigid foam (expanded polystyrene) for insulating and packing and as a glasslike material in light fittings and water tanks
References in periodicals archive ?
Company capacity shares for key Polystyrene producers
Joining can also be much easier with polystyrene than with wood.
EEP's polystyrene sheets are marketed under the brand name E-Foam, whose main application is for heating insulation, anti-impact material and major construction elements.
Coun Curtis said: "This is not a call for a ban on packaging in general - this is for fast food packaging such as those used by takeaway restaurants and polystyrene cups or containers.
Just last month the city council of New York unanimously decided to vote for a ban on polystyrene food containers.
Solid waste: Polystyrene cups for 16-ounce hot drinks create significantly less waste by volume than paperboard cups with corrugated sleeves for insulation.
According to leading environmental groups, the polystyrene in food trays and other products is dangerous to both people and ecosystems "The basic building block chemicals of polystyrene.
According to the contract, TPF is to continue polystyrene production on behalf of Polimeri until September 2011, with the exception of the expandable polystyrene unit reactors which will close in September 2010.
THE EUROPEAN Commission has cleared the proposed sale of Belgium-based Polimeri's polystyrene business, to France-owned Total Petrochemicals Feluy.
Summary: TEHRAN (FNA)- The Iranian experts took a major step forward in settling the flammability problem of polystyrene foams by synthesizing a type of polystyrene nanocomposite foamed by water.
Kong and colleagues dissolved polystyrene - a polymer used to make disposable foam plates and cups - into biodiesel at concentrations ranging from 2 to 20% polystyrene by weight.
An innovation project has paved the way to BASF's success in using a conventional stretch blow-moulding machine at Krones AG to create the lightest half-litre polystyrene bottle ever: it weighs a mere 7.