Cyanate


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Related to Cyanate: Ammonium cyanate, sodium cyanate

cyanate

[′sī·ə‚nāt]
(inorganic chemistry)
A salt or ester of cyanic acid containing the radical CNO.

Cyanate

 

a salt or ester of cyanic acid. Cyanate salts, unlike cyanic acid, are very stable compounds: for example, sodium cyanate, NaOCN, has a melting point of 550°C, and potassium cyanate, KOCN, decomposes without melting only at 700°C.

The cyanate salts of the alkali metals are soluble in water and insoluble in alcohol and ether. They are produced by the oxidation of the corresponding cyanides by atmospheric oxygen or by the lead oxides PbO or PbO2. They are used in various syntheses, for example, in the production of semicarbazide. Ammonium cyanate, NH4OCN, which was used by F. Wöhler in the first successful synthesis (1828) of an organic compound (urea) from an inorganic compound, may be obtained in an exchange reaction from silver cyanate and ammonium chloride.

Esters of cyanic acid exist in two isomeric forms: ROCN and RNCO. The cyanate esters (ROCN) do not have practical importance, while isocyanates (RNCO) are used in industry for the production of polyurethanes and herbicides. (SeeISOCYANATES.)

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References in periodicals archive ?
Due to excess hydroxyl groups afforded by the alumina particle surface, the [T.sub.g] decreases monotonically which is considered detrimental to the function of thermosetting polymers, such as cyanate esters, developed for high temperature applications.
A phenolic triazine SMC, using a phenolic-based cyanate ester, is expected to be available from QCI shortly.
has eloquently characterized the effects of hydrolysis on neat cyanate ester resin and blends (21), (22).
The curing of BECy occurs by the cyclotrimerization of three cyanate groups (-OCN) and results in a highly crosslinked network.
Like the rubber-modified resins, a new group of modified aromatic cyanate ester resins from ICI Fiberite, Tempe, Ariz., offers low moisture absorption and strong electrical properties.
The catalytic effect of alumina is believed to be the result of the surface hydroxyl groups and physically adsorbed water, which act as a catalyst to initiate the cross-linking of cyanate ester (2).
Mechanism of the transformation of ammonium cyanate into carbamide and the decomposition of carbamide by heat.
Mao, "New thermosetting resin from benzoxazine and cyanate ester resin," Advances in Polymer Technology, vol.
Scientists at Albert Einstein College of Medicine in New York City had recently discovered that ingesting cyanate salts could prevent the "sickling" of red blood cells that leads to the anaemia and pain of sickle cell disease.