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polysiloxane |
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siliconeor polysiloxaneAny of a diverse class of polymers manufactured as fluids, resins, or elastomers. They 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. polysiloxane [¦päl·i·si′läk‚sān] (organic chemistry) (R2SiO)nA polymer in which the chain contains alternate silicon and oxygen atoms; in the formula, R can be H or an alkyl or aryl group; commercially, the R is usually CH3(the methylsiloxanes); properties vary with molecular weight, from oils to greases to rubbers to plastics. 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 | Following a general review on polysiloxane synthesis, chapters cover silicones in industrial applications, polysiloxanes as templates and building blocks in nanostructured materials, photochemistry of polysiloxanes, polysilanes, polycarbosilanes, polysilzanes, and polyferrocenylsilane-based polymer systems. A polysiloxane has a formula where each R1 is selected from alkyl, aryl and alkoxy groups having up to six carbon atoms, reactive glycidoxy groups and OSi(OR3)3 groups. [ILLUSTRATION OMITTED] For a topcoat, the artist used Interfine 878, a patented, isocyanate-free, inorganic acrylic polysiloxane coating designed to withstand exposure to ultraviolet light much longer than more widely available acrylic, polyurethane, and epoxy polysiloxane formulations. |
polysiloxane |
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