Curing of a CFR Epoxy Prepreg

In this example, the curing of a carbon fiber-reinforced epoxy prepreg (CFRP) in a press at 120°C was measured at a frequency of 10 Hz. The plot shows ion viscosity (green curve) which is derived from the loss factor (blue curve).
Ion viscosity increases as curing progresses and achieves a nearly horizontal level after 14 min, signaling a 100% degree of curing. The temperature measured on the same DEA channel yields a large exothermal curing effect: peak of 162°C.