Meaning
Quantified model of the chemical transformation from a liquid resin to a solid cross-linked network. It measures the heat of reaction and the degree of conversion over time, excluding physical properties like viscosity or color.
Reaction Rate
Speed of the chemical bonding process depends heavily on the ambient temperature and the specific catalyst used in the mixture. A higher temperature generally accelerates the epoxy cure kinetics, reducing the time needed for the material to reach a handling strength. However, excessive heat can lead to thermal degradation or internal stresses that weaken the final assembly.
Thermal Profile
Distribution of heat through the thickness of a part determines whether the core cures at the same rate as the surface. Large composite structures require careful monitoring to ensure that the exothermic reaction does not exceed safe limits. Using a pre-defined ramp and soak cycle prevents the formation of voids or incomplete bonds in the material.
Quality Metric
Measurement of the glass transition temperature provides a definitive way to confirm that the reaction has reached the required completion level. If the material is removed from the mold too early, it may lack the necessary mechanical properties for its intended application. Successful validation of the cure ensures that the product will withstand environmental stresses during its operational life.
