/sil"i kohn'/, n. Chem.any of a number of polymers containing alternate silicon and oxygen atoms, as (-Si-O-Si-O-)n, whose properties are determined by the organic groups attached to the silicon atoms, and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent: used as adhesives, lubricants, and hydraulic oils and in electrical insulation, cosmetics, etc.[1905-10; SILIC(ON) + -ONE]
* * *or polysiloxaneThey are partially organic compounds, but, unlike most polymers, they have a backbone containing no carbon, composed instead of alternating silicon and oxygen atoms. In most silicones, two organic groups (see functional group), usually methyl or phenyl, are attached to each silicon atom. Silicones in general are exceptionally stable and inert. Silicone fluids are used in hydraulic fluids, emulsion-breaking compositions, and breast implants and as adhesives, lubricants, water repellents, and protective coatings. Silicone rubbers are used as electrical insulators in encapsulations, coatings, and varnishes; as gaskets and caulking material; in specialized tubing; as automobile engine components; as flexible windows in face masks and air locks; for laminating glass cloth; and as surgical membranes and implants.
* * *also called Polysiloxane,any of a diverse class of chemical polymers manufactured in the form of fluids, resins, or elastomers. Although they are partially organic in composition, the molecules of silicones differ from those of most polymers in that the backbone of their structure does not contain carbon, the characteristic element of organic compounds, but is a polysiloxane chain, in which atoms of silicon and oxygen alternate. In most members of the class, two organic groups, usually methyl (−CH3) or phenyl (−C6H5), are attached to each silicon atom.Silicone fluids are exceptionally stable to decomposition by heat, water, or oxidizing agents and are good electrical insulators. They are used as components of hydraulic fluids and emulsion-breaking compositions and to impart water-repellency to textiles, paper, and many other substances.Silicone rubbers are valued for their electrical insulating properties, chemical stability, and the wide temperature range over which they retain resiliency. Silicone resins are used in protective coatings and electrically insulating varnishes and for laminating glass cloth. In the second half of the 20th century, silicone gels were used as breast (mammary gland) implants in women, though this application was curtailed in the early 1990s owing to its possible health risks.
* * *
Look at other dictionaries:
silicone — [ silikon ] n. f. • 1906; autre sens 1874; de silicium ♦ Nom générique des dérivés du silicium renfermant des atomes d oxygène et des groupements organiques, et se présentant sous forme d huiles, de résines et d élastomères. Huiles de silicones,… … Encyclopédie Universelle
silicone — coined 1863 in German from silico , comb. form indicating the presence of SILICON (Cf. silicon), + ONE (Cf. one) … Etymology dictionary
silicone — s. f. Nome genérico de substâncias análogas aos corpos orgânicos, em que o silício substitui o carbono … Dicionário da Língua Portuguesa
silicone — ► NOUN ▪ a durable synthetic resin with a structure based on chains of silicon and oxygen atoms with organic side chains … English terms dictionary
silicone — [sil′ikōn΄] n. [ SILIC(O) + ONE] any of a group of polymerized, organic silicon compounds containing a basic structure of alternate oxygen and silicon atoms, usually with various organic groups attached to the chain: characterized by relatively… … English World dictionary
Silicone — Not to be confused with the metalloid chemical element Silicon. Silicone caulk can be used as a basic sealant against water and air penetration. Silicones are inert, synthetic compounds with a variety of forms and uses. Typically heat resistant… … Wikipedia
Silicone — Les silicones, ou polysiloxanes, sont des composés inorganiques formés d une chaine silicium oxygène (... Si O Si O Si O ...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour… … Wikipédia en Français
Silicone — I Silicone [zu Silicium], Singular Silicon das, s, Silikone, Polymere und Oligomere, die sich aus Silicium Sauerstoff Ketten mit organischen Resten an den Siliciumatomen aufbauen … Universal-Lexikon
silicone — polisiloksanas statusas T sritis radioelektronika atitikmenys: angl. silicone; silicone compound vok. Silikon, n; Silikonverbindung, f rus. кремнийорганическое соединение, n; силикон, m pranc. composition silicone, f; silicone, m … Radioelektronikos terminų žodynas
silicone — [[t]sɪ̱lɪkoʊn[/t]] N UNCOUNT: usu N n Silicone is a tough artificial substance made from silicon, which is used to make polishes, and also used in cosmetic surgery and plastic surgery. ...silicone lubricants. ...women who suffered health problems … English dictionary