A model for the prediction of structure–property relations in cross-linked polymers

A model is presented that predicts the nonlinear mechanical properties of a highly cross-linked thermosetting polymer as a function of temperature, strain, and strain rate. The model is a significant extension of Group Interaction Modelling (GIM) that was originally developed for linear amorphous thermoplastics. Fundamental energy contributions within and between characteristic mer units are used to model the dynamic mechanical spectrum of the polymer. This enables the model to be applied to the prediction of the full stress–strain profile through yield. Tetraglycidyl 4,4′-diaminodiphenylmethane cured with 4,4′-diaminodiphenylsulphone is used as a detailed example for validation and the model predictions are in good agreement with experiment.