Processes occurring during the transition from strong to fragile relaxation in glass-forming substances
A.A. Lukichev 1
1Institute of Geology & Nature Management FEB RAS, Blagoveshchensk, Russia
Email: lukichevaa@mail.ru
Processes occurring in the vicinity of the crossover point in glass-forming substances on the example of epoxy resin are considered. The crossover point is considered as the strong-to-fragile transition in glassformers. The transition is accompanied by the association of free molecules into clusters with decreasing temperature. It is shown that the frequency (temperature) spectra of the substance exhibiting the transition can be represented as the sum of the spectra corresponding to the motion of free molecules and clusters. In the transition region the nature of internal friction changes. It is shown that strong relaxation is due to the movement of free molecules and molecule-molecule interaction; cluster relaxation is caused by inter-cluster interaction. Three different types of interaction are observed simultaneously in the transition region: cluster-cluster, molecule-molecule, and molecule-cluster. It is shown that the secondary relaxation of the β-type is caused by free molecules motion and molecule-cluster interaction. The presence of clusters is a necessary condition for the emergence of secondary relaxation. Keywords: Glass forming substances, fragility, viscosity, relaxation.
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