silicone

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silicone,

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,
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 in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH3, are bound to the silicon atoms. Silicones, which are unusually stable at extreme temperatures (both high and low), may occur as liquids, rubbers, resins, or greases. Silicones are prepared from halides of organic silicon compounds by decomposition. Such compounds are chosen and used in mixtures that allow the desired molecular weight and degree of cross-linking to be obtained in the final polymer. Water repellent, chemically inert, and stable at extreme temperatures, silicones are used as protective coatings and electrical insulators and in caulk.

Implants consisting of silicone gel surrounded by hard silicone were used in reconstructive and cosmetic breast surgery until 1992. The safety of inserting silicone prostheses into the body was questioned in a large product-liability case involving breast implantsbreast implant,
saline- or silicone-filled prosthesis used after mastectomy as a part of the breast reconstruction process or used cosmetically to augment small breasts.
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, but an Institute of Medicine panel concluded in 1999 that there was no evidence linking such implants with cancer, autoimmune diseases, and other serious illnesses. The use of such silicone implants for reconstructive surgery and for cosmetic surgery has been again approved by the FDA since 1998 and 2006 respectively.

silicone

[′sil·ə‚kōn]
(materials)
A fluid, resin, or elastomer; can be a grease, a rubber, or a foamable powder; the group name for heat-stable, water-repellent, semiorganic polymers of organic radicals attached to the silicones, for example, dimethyl silicone; used in adhesives, cosmetics, and elastomers.

silicone

One of the family of polymeric materials in which the recurring chemical group contains silicon and oxygen atoms as links in the main chain; derived from silica and methyl chloride; characterized by resistance to heat and a low coefficient of thermal expansion.

silicone

Chem
a. any of a large class of polymeric synthetic materials that usually have resistance to temperature, water, and chemicals, and good insulating and lubricating properties, making them suitable for wide use as oils, water-repellents, resins, etc. Chemically they have alternate silicon and oxygen atoms with the silicon atoms bound to organic groups
b. (as modifier): silicone rubber

silicone

A material that is used to make lubricants, sealants, adhesives, gels, coatings and breast implants. Silicone (pronounced "sill-uh-kone") is a compound of silicon (pronounced "sill-uh-kin") and other materials. See silicon.
References in periodicals archive ?
Generally, conventional addition curable silicone resins contain three components: branched poly (methylphenylvinylsiloxane) (B-PMPVSi) as the matrix, linear poly (methylphenylvinylsiloxane) (L-PMPVSi) as the reactive diluent, and hydrogen-functionalized polysiloxane with low degree of polymerization as the cross-linking agent (4).
Observation from DSC measurements shows that the silicone resins are typical amorphous polymers with glass transition temperature [T.sub.g] = 40-46 [degrees]C (Takahashi et al., 2001).
Type of resins: Acrylic resins; alkyd resins; crosslinking resins; epoxy resins; high-solid resins; polyester resins; silicone polyesters; silicone resins; urethane/polyurethane resins; vinyl resins
These polymers consist mainly of aqueous dispersions or emulsions of silicone resins, linear siloxane polymers, or elastomers.
The as-prepared silicone resins were applied on HDPE-substrate films by direct three roll coating (Fig.
Our line of additives and silicone resins are utilized in a variety of UV solvent and water based inks.
Get a concentrated overview of the chemistry and technology of silicone resins and insight into their use from an industrial point of view: this completely revised and expanded edition reports on most recent developments and points out the outstanding properties of silicones for coatings.
Hyde's progress with silicone development had reached such a critical stage that Corning Glass Works launched a joint partnership with the Dow Chemical Company to commercialize some of Hyde's silicone resins. (21) The joint venture was formally finalized on February 9, 1943, and called the Dow Corning Corporation and was located in Midland, MI, near the Dow Chemical Company plant.
Silicone resins: Silicone resin technology continues to evolve, giving lipsticks, foundations, eyeliners and other color cosmetics longer, more comfortable wear without transfer.
The question of mechanical property dependence on temperature has been brought up repeatedly when the toughened silicone resins are used for a range of applications, including structures in space.
The company also offers a line of additives and silicone resins that are utilized in a variety of architectural, industrial and OEM coatings.
According to the company, these specially modified silicone resins offer increased usability by giving a formulation better solvent resistance, lower thermoplasticity and higher pigment loading than standard silicone resins.