Demystifying Dielectric Data – Correlation With Non-Isothermal Thermoset Curing – Part 4
Jeffrey Gotro
Non-Isothermal Curing
During many thermoset processing steps (and in this example, lamination of a B-staged (partially cured) prepreg, a non-isothermal temperature ramp is used in the process. The viscosity profile for the B-staged prepreg at a heating rate of 10°C/minute to a cure temperature of 175°C is shown in Figure 1.
Figure 1. Viscosity as a function of time for a non-isothermal heating rate to a cure temperature of 175°C for an epoxy prepreg.
As the temperature ramps in the press, the...