Abstract
Heterocyclic polymer networks obtained by copolymerization of an epoxy oligomer and hexamethylene diisocyanate (HMDI) in different proportions have been studied by differential scanning calorimetry (DSC) in their glass transition regions. The glass transition temperature and the specific heat capacity increment at the transition correlate well with sample composition, whereas the index of the distribution of relaxation times seems to be unaffected by composition changes. The structural relaxation process is characterized with an equation for the configurational entropy, whose material parameters are determined by a fit to a wide class of thermal histories.
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