Phase morphology and chemical rheological properties of bismaleimide/polyethersulfone composite resin during curing

The non-isothermal dynamic differential calorimetry (DSC) was used to study the curing characteristics of bismaleimide (BMI)/polyethersulfone (PES) composite resin system. The microscopic phase structure was observed by SEM and the rotating flow was utilized. The chemical rheological properties of the BMI/PES complex system were investigated and the relationship between phase separation and rheological properties was investigated. The results show that with the increase of heating rate, the curing reaction rate of BMI/PES-25 resin is accelerated, and the curing characteristic temperature is moving to high temperature, but the curing enthalpy is basically unchanged. The chemical rheological properties show that the viscosity of the resin firstly remains constant (110 ~ 150 °C) with the increase of temperature, and then grows rapidly; the larger the amount of PES added in the system, the wider the temperature range corresponding to low viscosity; at 180 ~ 200 °C In the temperature range, the viscosity of the BM