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Polycyanurates prepared from cure of bisphenol A dicysanate (BPADCy) were modified with either hydroxyl-terminated or cyanated poly(ether sulfone)s (as HPES or CPES, respectively) of different molecular weights. With high molecular weight HPES (or CPES), the resulting resin showed a two-phase morphology in contrast to the single-phase morphology generated from the curing reactions of the low molecular...
Polycyclotrimerization of 4,4′-thiodiphenylcyanate (TDPC) and bisphenol-A dicyanate (BADC) were studied and compared by means of differential scanning calorimetry. Samples of different impurity levels (most likely residual moisture) or different catalyst loadings (n-nonylphenol) were studied. Moisture absorbed may indeed function as a catalyst. In the absence of residual phenols or added catalyst,...
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