Abstract
By means of the Forced Rayleigh Scattering (holographic grating relaxation) technique the diffusion of dye molecules in bulk films of polymer below entanglement molecular weight was investigated around the glass transition temperature. In the temperature range [Tg–20К; Tg+ 5К] a splitting of the dye diffusion coefficient into two separate branches was revealed. The phenomenon was found to be similar to that reported for thin polymer films, which may prove the dominating role of dynamic heterogeneities in the investigated temperature region.
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