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 ViscosityIon viscosity is the reciprocal value of the ion conductivity, which is calculated from the dielectric loss factor.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 ExothermicA sample transition or a reaction is exothermic if heat is generated.exothermal curing effect: peak of 162°C.