Statistical structural model for the gelation behaviour of cyanate‐epoxy polyreactions

Basing on the kinetics of the main reactions up to the gelation point – cyclotrimerization of the cyanate, insertion of the glycidylether group and abstraction of a phenol – a statistical structural model for the reaction of a dicyanate with a bisglycidylether was developed using a cascade approach. It was found that the critical OCN conversion shift to higher values compared with the classical 50% for the pure polycyclotrimerization is caused by the abstraction of the phenol with the aromatic rest of the cyanate monomer.