Abstract
Abstract In the present paper the mechanical and photomechanical behavior of two ethylene-propylene copolymers of different ethylene contents has been analyzed. This microstructural difference gives rise to differences in physical behavior. In particular, the physical properties of the sample of higher ethylene content are strongly temperature-dependent in the temperature range investigated. The results are discussed in terms of intermolecular interactions or aggregations and show a direct relationship between interaction phenomena, mechanical hysteresis, and deviations from the ideal Gaussian behavior of a rubberlike network.
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