Cyanate

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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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Compared to free cyanide, this sodium cyanate is less but still toxic.
Structural characterizations reveal that the plasma polymerization of three cyanate ester monomers proceeded mainly via the opening of [pi]-bonds of the cyanate ester functional groups and transforming them to a large [pi]-conjugated structure, which is noticeably different from the conventional thermal or catalytic cyclo-trimerization reaction of cyanate ester monomers.
In terms of new resins, cyanate esters seemed to be the stars of this show.
This study focused on biobased cyanate ester (CE) resin materials containing epoxidized soybean oil processed with copper (II) acetylacetonate as a catalyst and nonylphenol as a co-catalyst.
As the mobility of the reacting medium decreases, the curing of the semi-IPN system can be controlled by diffusion, On the other hand, cyanate concentration decreases with increasing PEI content, and this can be another reason for the reduced reaction rate of the semi-IPN system.
For nodding syndrome, a lack of association of cassava consumption in case-control studies and negative results of testing for urinary thiocyanate indicate that acute or ongoing cyanate exposure makes this specific etiology less likely.
16) Benzoxazine resins were considered to be alternative materials for epoxides, bismaleimides, cyanate esters, and polyimides.
Inhibition of Carcinogen-induced Neoplasia by Sodium Cyanate, tert-butyl Isothiocyanate and Benzyl Isothiocyanate Administered Subsequent to Carcinogen Exposure', Cancer Res.
A new cyanate ester resin system, EX-1515, from Bryte Technologies, Milpitas, Calif.
In one of these studies, Bauer and coworkers (14) reported that both the epoxy-terminated and phenol-terminated rubbers reacted with the cyanate covalently.
2) Incorporating IPDT in the HDT-based polyiso cyanate (Hardener 2) will improve anti-graffiti performance towards every testing graffiti except the black Sharpie.