Differential scanning calorimetry (DSC) has been employed to measure the thermal properties of two commercial cyanate esters (AroCy L10 and AroCy XU366) before and after blending with several commercial acrylates. DSC analysis of the cyanate homopolymerizations yields values of Delta H and apparent conversion in the cyanate and cyanate/acrylate blends which agree well with published data. For catalysed L10 and XU366 polymerizations trends are reported for the onset of polymerizations as a function of metal ion in the catalyst. The relative effects of each acrylate on the cyanate polymerization are considered in terms of the inhibition of the cyanate polymerizations. Thermal data are related to the nature of the polymer networks produced.