RELATION OF THE CURE-DEPENDENT DIRECTIONAL AND VOLUMETRIC EXPANSIVITY OF 8552/S2 EPOXY + GLASS FIBER LAMINATES TO THE GLASS TRANSITION

摘要

The cure-dependent expansivity of a composite 8552/S2 epoxy resin with glass fiber has been investigated by Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA), and Pressure-Volume-Temperature (PVT) techniques. Two glass transition temperature models have been developed as a function of temperature and time. The first model is based on DSC measurements, the second on measurements of the loss modulus in DMA. A comparison of the modeled volume changes of unidirectional and bi-directional laminates was made to determine which approach might be better suited to predict volumetric changes.