J. Phys. III France
Volume 5, Numéro 6, June 1995
Page(s) 791 - 805
DOI: 10.1051/jp3:1995161
J. Phys. III France 5 (1995) 791-805

Thermally Stimulated Creep: a Theoretical Understanding of the Compensation Law

J. Perez1 and J.Y. Cavaillé2

1  Groupes d'Etudes de Métallurgie Physique et Physique des Matériaux, URA CNRS 341, INSA, 69641 Villeurbanne cedex, France
2  Centre de Recherche sur les Macromolécules Végétales, CNRS, Université Joseph Fourier, BP 53 38041 Grenoble cedex 09, France

(Received 6 October 1992, revised 7 September 1993 and 6 July 1994, accepted 24 February 1995)

Experimental data from thermally stimulated techniques (either mechanical or electrical measurements) are often used to characterize polymeric materials. The very high values obtained for the apparent activation energy, associated with very short pre-exponential times, as well as the so-called "compensation law" have not yet been properly explained on a physical basis. The purpose of this work is to propose such an interpretation on the basis of a theoretical model already developed for the molecular mobility in amorphous polymers below and around $T_{\rm g}$.

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