Volume relaxation of glasses

Mansfield, Marc L.
June 1991
Journal of Chemical Physics;6/1/1991, Vol. 94 Issue 11, p7521
Academic Journal
The rate of volume relaxation of glasses is computed by assuming that the volume changes only because of the diffusion of free volume in and out of the sample through the surface. The relaxation curves are strongly affected by the assumed diffusion law, which means that such experiments provide a potentially powerful tool for determining the process by which free volume diffuses in glasses. For ordinary, i.e., Fick’s law, diffusion, the relaxation curves have exponential tails, while for anomalous diffusion of the sort introduced by Shlesinger and Montroll, the curves are predicted to have inverse-power law tails. Comparison with experimental results on glassy polymers permits us to rule out Fick’s law diffusion completely, and strongly supports the anomalous diffusion law of Shlesinger and Montroll.


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