Epoxy-Graphite Composite

A comparison of DEA and rheometer data during the cure of an epoxy-graphite composite system shows that for the first 150 min the mechanical viscosity and ion viscosity curves nearly superimpose, demonstrating the clear correlation between the two properties. Early in the 175°C final hold, the epoxy resin goes through gelation and the mechanical viscosity can no longer be measured. The ion viscosity signal continues to follow the entire reaction, even as the material cures into a rigid glass. (measurement with DEA 288 Epsilon)