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Thermodynamic description of relaxation phenomena in polymers
Author(s) -
Bartenev G. M.,
Zelenev Y. V.,
Borodin I. P.
Publication year - 1970
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1970.070140214
Subject(s) - non equilibrium thermodynamics , adiabatic process , relaxation (psychology) , creep , thermodynamics , perturbation (astronomy) , nonlinear system , kinetic energy , thermodynamic equilibrium , stress relaxation , materials science , polymer , statistical physics , mechanics , classical mechanics , physics , quantum mechanics , psychology , social psychology , composite material
The analysis of various deformations of an ordinary elastic body and a highly elastic body accompanied by temperature changes shows that, in distinction to isothermic conditions, under adiabatic conditions the dynamic characteristics of a polymer in a highly elastic state depend on the amplitude of the applied stress (in particular, their position on a frequency or temperature scale), which is associated with the entropic nature of the highly elastic deformation. When describing the relaxation phenomena caused by the response of the system of interacting kinetic units to the external perturbation, the nonequilibrium thermodynamics relationship between the “flow” and the “generalized force” is nonlinear even at small deviations from the equilibrium state. In this case the dependency of the kinetic factor on the response can be presented by eq. (40). Considered herein were such particular relaxation phenomena as creep and stress relaxation. The calculated dependencies agree well with the experimental data.