Abstract
A simple relationship between the Grüneisen parameter and Beyer's non-linearity parameter in the case of polymers has been obtained in terms of Mie potential parameters from the pressure dependence of bulk modulus. Using this simple model, it is shown that Beyer's parameter of non-linearity, Carnevale and Litovitz's acoustical parameter, Moelwyn-Hughes parameter and the Grüneisen parameter are all related to each other and express the same physical quantity for polymers. The contribution of interchain vibrations to the total specific heat and the specific heat ratio has been found from the Grüneisen parameter in case of twelve polymers. It is proposed that the dependence of the isobaric specific heat of polymeric materials on the interchain forces is stronger than of the isochoric specific heat.
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