Structure-Properties Relationships for Bisphenola Polycyanurate Network Modifiedwith Polyoxytetramethylene Glycol

A series of polycyanurate networks (PCNs), based on the dicyanate of bisphenol A monomer (DCBA), were synthesized in the presence of diAerent contents of hydroxylterminated polyoxytetramethylene glycol (PTMG). The chemical structure, Tg 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 Tg 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.