Resorcinol dicyanate

Table I. Resorcinol Dicyanate Cured Resin Properties...

Although many organizations have been involved in high temperature adhesive development for captive use and as a service to their customers, most of this information is proprietary and the remainder is seldom published. An example of a promising adhesive with the potential for high temperature application is the cured resin from 1,3-dicyanatobenzene (resorcinol dicyanate) as shown in Eq. (7) ... 

No aging and subsequent testing were performed beyond those in Table 13. Resorcinol dicyanate is one of many examples where excellent potential was demonstrated but no further results are available. Problems such as availability, toxicity, moisture and solvent resistance, low shelf life, processability, etc. often discourage further adhesive development. ResorcinoMicyanate is unavailable but a few other dicyanates are commercially available. No adhesive properties have been reported on these dicyanates. The adhesive work on resorcinol dicyanate is representative of company funded research that is not readily available to the public. 

Table 13. Tensile Shear Strength of Resorcinol Dicyanate...

A variety of CEs with tailorable physico-chemical and thermo-mechanical properties have been synthesized by appropriate selection of the precursor phenol [39,40]. The physical characteristics like melting point and processing window, dielectric characteristics, environmental stability, and thermo-mechanical characteristics largely depend on the backbone structure. Several cyanate ester systems bearing elements such as P, S, F, Br, etc. have been reported [39-41,45-47]. Mainly three approaches can be seen. While dicyanate esters are based on simple diphenols, cyanate telechelics are derived from phenol telechelic polymers whose basic properties are dictated by the backbone structure. The terminal cyanate groups serve as crosslinking sites. The polycyanate esters are obtained by cyanation of polyhydric polymers which, in turn, are synthesized by suitable synthesis protocols. Thus, in addition to the bisphenol-based CEs, other types like cyanate esters of novolacs [37,48], polystyrene [49], resorcinol [36], tert-butyl, and cyano substituted phenols [50], poly cyanate esters with hydrophobic cycloaliphatic backbone [51], and allyl-functionalized cyanate esters [52] have been reported. 

Dicyan (from NaCN, Cu-sulfate, and water) and HC1 at —30 introduced into an autoclave containing a mixture of resorcinol, A1C13, and ether, the autoclave closed, allowed to stand at room temp, for 2 days, poured on ice, separated from the ether, and the resulting ketimlne dihydroehloride (which precipitates at a high concentration of HC1 and can then be isolated) hydrolized by boiling in an aq. soln. 

For the one-part systems diglycidyl ethers of bisphenol and diglycidyl ethers of resorcinol have been utilised with hardeners such as dicyan-diamide, aromatic substituted ureas and boron trifluoride amine complexes. For further information on component mounting with epoxides the reader is referred to an excellent review by Marshall. ... 

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