/pol'ee stuy"reen, -stear"een/, n. Chem.
a clear plastic or stiff foam, a polymer of styrene, used chiefly as an insulator in refrigerators and air conditioners.
[1925-30; POLY- + STYRENE]

* * *

      an important member of the class of synthetic organic polymers, composed of long-chain molecules prepared by a chemical reaction in which many (usually 2,000–3,000) molecules of the aromatic hydrocarbon styrene become linked together.

      Large-scale manufacture of polystyrene was begun in the late 1930s; usually the styrene is dispersed in water with the aid of soap, and the polymerization reaction is initiated by free-radical catalysts. The product, an inexpensive, strong, thermoplastic (softened by heat) resin that resists attack by acids, alkalies, and many solvents, does not absorb water and is an excellent electrical insulator.

      Addition of rubber latex to the suspension in which polystyrene is made greatly increases its resistance to impact. By the mid-1960s, more than half the polystyrene made in the United States was produced by this process. Polystyrene has numerous uses, as in making housings for such large household appliances as refrigerators and air conditioners.

* * *

Universalium. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • polystyrène — [ pɔlistirɛn ] n. m. • 1936; de poly et styrène ♦ Matière plastique obtenue par polymérisation du styrène. Panneau isolant en polystyrène expansé. ● polystyrène nom masculin Polymère du styrène, de formule générale . polystyrène n. m. CHIM… …   Encyclopédie Universelle

  • Polystyrene — Polystyrène (homonymie) Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Le terme polystyrène désigne deux entités différentes : Le polystyrène est un polymère de styrène (formule développée :… …   Wikipédia en Français

  • polystyrene — UK US /ˌpɒlɪˈstaɪriːn/ noun [U] (US also Styrofoam™) ► a light usually white plastic used especially for protecting delicate objects inside containers from damage, or for protecting something from losing heat: »Every year more than six billion… …   Financial and business terms

  • polystyrene — (n.) 1927, so called because it is a POLYMER (Cf. polymer) of STYRENE (Cf. styrene) …   Etymology dictionary

  • polystyrene — ► NOUN ▪ a synthetic resin which is a polymer of styrene …   English terms dictionary

  • polystyrene — [päl΄i stī′rēn΄] n. a tough, clear, colorless plastic material, a polymer of styrene, used to make chemical apparatus, containers, etc …   English World dictionary

  • Polystyrene — For other uses, see Polystyrene (disambiguation). Expanded polystyrene packaging …   Wikipedia

  • Polystyrène — Pour les articles homonymes, voir Polystyrène (homonymie). Polystyrène Général …   Wikipédia en Français

  • polystyrene —    A plastic which is available in several forms: Toughened polystyrene is a rigid plastic in sheet or board form. Foam core or foam board is a strong, stiff, resilient, and lightweight board of polystyrene laminated with paper on both of its… …   Glossary of Art Terms

  • polystyrene — [[t]pɒ̱lɪsta͟ɪriːn[/t]] N UNCOUNT Polystyrene is a very light plastic substance used to make containers or to keep things warm, cool, or protected from damage. ...polystyrene cups …   English dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”