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By C. P. Reghunadhan Nair, Dona Mathew (auth.)


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Extra resources for New Polymerization Techniques and Synthetic Methodologies

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Most of the reported work on the catalysis of cyanate cure gives unreliable and at times conflicting results because of the imperfection in the methods employed and the uncertainties of the kinetic models assumed [100, 102, 106, 112–16]. With the objective of generating quantitative information on their relative catalytic efficiency in terms of the kinetic activation parameters and to establish the correlations between the catalytic efficiency and the characteristics of transition metal acetyl acetonates, a detailed investigation of the kinetics of thermal cure of BACY by these materials has been performed by us [115].

P. N. Ninan Cyanate Ester Resins, Recent Developments 53 stability than the bisphenol-based epoxy resin, due to the steric hindrance to crosslinking by the bulky naphthalene rings. Presence of the hydrophobic backbone of the former was responsible for its reduced moisture absorption. As mentioned earlier, the cyanate-epoxy systems find many commercial applications. Many multifunctional formulations, principally based on CE/epoxy, have been claimed. Generally, the properties of epoxies are improved on co-curing by cyanate ester and the blend is more cost-effective than cyanate alone.

They also reported the crosslinking polymerization of 2-allyl phenyl cyanate by itself, with other dicyanates, and with olefinic monomers. Cyanate ester has been reported as cure accelerator for epoxy and was also conducive for increasing the Tg and thermal stability of the cured network when diglycidyl ether of bisphenol A was cured by 4,4¢-diamino diphenyl sulfone in the presence of BACY. The reaction was followed by FTIR and rheometrically [182]. The cured products from multifunctional, naphthalene-containing epoxy resin and BACY were reported to exhibit better Tg and lower coefficient of thermal expansion in comparison to commercial epoxy systems [183].

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