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polyphosphoric acid |
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polyphosphoric acid [¦päl·i·fä′sfȯr·ik ′as·əd]
(inorganic chemistry) H6P4O13Viscous, water-soluble, hygroscopic, water-white liquid; used wherever concentrated phosphoric acid is needed. 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 | Specifically, it is added to flame retardants, because they change as a result of high temperature thermal decomposition into polyphosphoric acid, (1), (2) which forms a heat resistant carbonaceous protective layer and interferes with the transport of oxygen to the burning zone. Keywords: Polyphosphoric acid (PPA), Acylation reactions, Fries rearrangement, Hydroxyaryl Ketones, Phenol derivatives. The flame retardancy mechanisms of RP have been described as follows: the oxidation of RP first occurs with increasing temperature, then the produced oxide reacts with the water from decomposed polymer to produce metaphosphoric acid, phosphoric acid, and polyphosphoric acid, which can cover the surface of the burning materials by a liquid film, and further promote the dehydration of polymers to form a stable char layer. |
polyphosphoric acid |
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