Abstract
Strain calorimetry has been used to study the thermodynamics of softening and hysteresis phenomena in PU elastomers of varied composition and with varied mechanical prehistory. It is shown that the contribution of the rigid domains to the mechanism of strain of PU elastomers governing the hysteresis properties is determined by the mechanical prehistory and also the content of the rigid component. This contribution gives inhomogeneity of the mechanical p behaviour both of the initial and softened samples. The instability of the behaviour of the softened systems is attributed to the interaction of the flexible and rigid components.
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