Abstract
The cured resins obtained by combining cyanate esters with phenol compounds showed much lower dielectric constant (Dk) and dissipation factor (Df) than those of the conventional cured resins. It was concluded that this characteristics are due to their unique resin structures, in which the phenol compounds are incorporated in the triazine structures during the curing to form a loose cross-linking structure. Consequently the reaction rate of the cyanato group will increase and the quantity of unreacted cyanato groups remaining within the cured resin will decrease. More modifying effect was obtained by the phenol compounds with the electron-donor functional group, which are weak in acidity. As a result, it was realized that the lower cross-linking density of the cured resin by modifying the network structure with some compounds is effective in decreasing dielectric constant (Dk) and dissipation factor (Df).
