Chemistry and technology of silicones pdf
Silicone - WikipediaAncient ceramics are a mainstay of archaeological assemblages, second to nothing in their sheer number of finds at almost all sites and in all cultures pertaining to the last ten thousand years, and as such unsurpassed in their information potenti Du kanske gillar. Human Compatible Stuart Russell Inbunden. Lifespan David Sinclair Inbunden. Chemistry and Technology of Silicones e-bok av Walter Noll. Ladda ned. Spara som favorit.
What are Silicones?: Structure and Uses
Chemistry and Technology of Silicones
Silicones , also known as polysiloxanes , are polymers that include any synthetic compound made up of repeating units of siloxane , which is a chain of alternating silicon atoms and oxygen atoms, combined with carbon , hydrogen , and sometimes other elements. They are typically heat-resistant and either liquid or rubber -like, and are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. Some common forms include silicone oil , silicone grease , silicone rubber , silicone resin , and silicone caulk. These silicon atoms are tetravalent. So, silicones are polymers constructed from inorganic -organic monomers. Silicones have in general the chemical formula [R 2 SiO] n , where R is an organic group such as an alkyl methyl , ethyl or phenyl group. In some cases, organic side groups can be used to link two or more of these —Si—O— backbones together.
Silicones are a diverse family of specialty, high-performance materials that includes reactive silanes, silicone fluids and silicone polymers, which are widely used in a variety of consumer and industrial products. These materials provide essential benefits in key segments of our economy, including health care, aerospace, personal care, electronics, transportation and construction. Silicones impart a number of benefits to the products in which they are used, including enhanced flexibility and moisture, heat, cold and ultraviolet radiation resistance. Silicones can be manufactured in many forms, including solids, liquids, semi-viscous pastes, greases, oils and rubber. Silicones used in personal care products reduce the white residue and tacky feel of antiperspirants in deodorants. Wetting and spreading qualities provide for smooth and even application of cosmetics, lotions, sunscreens and cleansers. Silicone improves the efficiency, durability and performance of solar panels and photovoltaic devices, making them more cost-effective.