Collect. Czech. Chem. Commun. 1980, 45, 2315-2318

Contribution to the determination of relative increment of internal energy at low deformation of cross-linked rubber

Vladimír Pollák and Andrej Romanov

Institute of Polymers, Slovak Academy of Sciences, 809 34 Bratislava


The relative charge of the internal energy, fU/f, during deformation of cross-linked elastomers, poly(ethylene-co-propylene) and poly(ethylene-co-vinyl acetate), was determined at various temperatures. Anomalies in the dependence of fU/f on relative dilatation in the region of small deformations ( 35%) are to a large extent besides other factors due to the sensibility of the formula used to calculate fU/f to temperature changes.