Abstract
Characterization of detailed network structure based on the theory of branching processes is reviewed. Correlations between the calculated structural parameters and the dynamic mechanical behaviour of polyurethane and flexible epoxy-amine networks in the main transition region are suggested. The comparison with the experiment reveals that the average length of elastically active network chain has a decisive effect on the width of the retardation spectrum in the main transition and rubbery zone. The effect of the temperature dependence of the internal energy of network chains on viscoelastic behaviour is examined.
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