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Polyethylene Terephthalate |
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polyethylene terephthalate [¦päl·ē′eth·ə‚lēn ‚ter·ə′tha‚lāt]
(organic chemistry) A thermoplastic polyester resin made from ethylene glycol and terephthalic acid; melts at 265°C; used to make films or fibers. Abbreviated PET. Polyethylene Terephthalate a polyester produced by polycondensation of terephthalic acid or its dimethyl ether with ethylene glycol.
Polyethylene terephthalate is a white, odorless solid with molecular weight 20,000–40,000; the maximum crystallinity of unoriented polyethylene terephthalate is 40–45 percent, and of the oriented variety, 60–65 percent; density, 1.38–1.40 g/cm3(20°C); melting point, 255°-265°C; softening point, 245°-248°C. Polyethylene terephthalate is insoluble in water and organic solvents and is relatively resistant to dilute acid solutions, such as 70-percent H2SO4, 5-percent HCl, or 30-percent CH3COOH, and to cold solutions of alkalies and bleaching agents, for example, sodium hypochlorite or hydrogen peroxide. It hydrolyzes under the action of alkaline solutions at temperatures above 100°C and, at 200°C, even under the action of water. Polyethylene terephthalate has high strength and resistance to abrasion and repeated tensile and bending stress, low hygro-scopicity (moisture content, 0.4–0.5 at 20°C and 60 percent relative humidity), and a working temperature range of –60° to 170°C. It is a good dielectric (loss tangent, 0.013–0.015 at 1 megahertz) and is relatively resistant to light, X rays, and γ-rays. Polyethylene terephthalate is processed mainly into fibers and films, and also into various molded products, such as radio components and chemical equipment. World production of polyethylene terephthalate in 1973 was about 3.5 million tons. REFERENCESSee references underE. AIZENSHTEIN Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | It is one of the world's leading suppliers of engineering thermoplastics offering a broad portfolio of high-performance products including Stanyl high-performance polyamide and Akulon 6 and 66 polyamides, Arnitel TPC, Arnite PBT and PET polyesters, Xantar polycarbonate, Yparex extrudable adhesive resins. Arnite XG is designed for connectors in unattended appliances and meets the standard in IEC 60695. Arnite thermoplastic polyesters are a focused line of engineering materials based on polybutylene terephthalate and polyethylene terephthalate, according to a 28-page brochure. |
Arnite |
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