Differential Scanning Calorimetry Cure Studies of Tetra‐N‐glycidyldiaminodiphenylmethane Epoxy Resins Part 2 ‐ Reaction with 4,4′‐Diaminodiphenylsulphone Accelerated by Borontriofluoride‐Ethylamine

Abstract The curing reaction was monitored by differential scanning calorimetry scans at various heating rates and from isothermal experiments in the range 130–170°C. The catalysed isothermal cure is an initially rapid reaction which approximates to first‐order kinetics. Above about 30% conversion there is a transition to a much slower first‐order reaction. The differential scanning calorimetry scans show multiple exotherm peaks, indicative of a complex reaction. However, data at a given conversion can be described by a simple general kinetic model. The heat of reaction shows a decreasing trend with increasing catalyst concentration.