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olefin |
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olefin (ō`ləfĭn) or olefin series: see alkene alkene (ăl`kēn), any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon double bonds (see ..... Click the link for more information. . olefinor alkeneAny unsaturated hydrocarbon containing one or more pairs of carbon atoms linked by a double bond (see covalent bond, saturation). Olefins may be classified by whether the double bond is in a ring (cyclic) or a chain (acyclic, or aliphatic) or by the number of double bonds (monoolefin, diolefin, etc.). Rare in nature, olefins are obtained by the cracking of petroleum fractions at high temperatures. The simplest ones (ethylene, propylene, butylene, butadiene, and isoprene) are the basis of the petrochemicals industry. They react by adding other chemical agents at the double bond to form derivatives or polymers. olefin [′ō·lə·fən] (organic chemistry) CnH2nA family of unsaturated, chemically active hydrocarbons with one carbon-carbon double bond; includes ethylene and propylene. (textiles) A manufactured fiber in which the fiber-forming substance is any long-chain synthetic polymer composed of at least 85% by weight of ethylene, propylene, or other olefin units except amorphous (noncrystalline) polyolefins qualifying as rubber. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Session 2 on "Transparent and translucent polymers," will include the following presentations: "Copolyesters for the medical market," Bart van de Krol, Eastman Chemical, the Netherlands; "Cyclic olefinic copolymer: An innovative, transparent plastic material for applications in medical and diagnostic," Michael Grimm, Topas Advanced Polymers, Germany; and "Silicone elastomers in medical applications," Andre Colas, Dow Coming, Belgium The system is a breakthrough because olefinic materials, due to their inertness, have relied almost exclusively on post-molding secondary operations such as plasma, corona, or flame treatments to obtain adhesion promotion by oxidizing the plastic surface. The TPV is recyclable in the olefinic recycle stream. |
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