Linear response theory and the mechanical energy relaxations of solid high polymer systems

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Abstract
Linear response theory is applied to mechanical energy relaxation phenomena of polymer solids below the glass transition temperature. The relaxation modulus is related to time-correlation functions of ’’forces.’’ The time-correlation functions are approximately calculated in the paper in the single relaxation time model. The relaxation time is explicitly calculated in the approximation for systems with pendant cyclohexyl groups. The results obtained are examined in the light of experimental data and show that the present linear response theory approach is promising for mechanical spectroscopy of solid polymer systems.