Abstract
A series of polycyanurate networks (PCNs), based on the dicyanate of bisphenol A monomer (DCBA), were synthesized in the presence of different contents of hydroxyl-terminated polyoxytetramethylene glycol (PTMG). The chemical structure, T g behaviour, modulus-composition relations and mechanical properties of the modified PCNs were investigated by Fourier transform infrared (FTIR) spectroscopy, dynamic mechanical thermal analysis (DMTA) and mechanical testing. The oligomer modifier influences the structure of the final networks insofar as it is partly incorporates and partly dissolves in the polycyanurate matrix, and, thus, decreases the final T g of these modified thermosets. All modified polycyanurate networks exhibit a single, broad glass transition that shifted to lower temperature as the modifier content was increased.
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