Evidence for the Shift of the Glass Transition near the Particles in Silica-Filled Elastomers
Résumé
Filled elastomers exhibit complex dependence of their viscoelastic modulus, both as a function of temperature and frequency. Otherwise, recent observations on thin polymer films have shown that their glass transition temperature depends on their thickness. Based on these recent results, and on a recent model, we propose that the mechanical behaviour of the filled elastomer is strongly influenced by a gradient of the glass transition temperature in the vicinity of the particles. This allows us to suggest a specific temperature-frequency superposition law for filled rubbers. This law seems to apply very successfully on two systems with different dispersion qualities, revealing the existence of a glass transition temperature gradient in the vicinity of the particles.
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