Glass transition temperature and dynamics of α-process in thin polymer films
- 1 June 1999
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 46 (5) , 649-654
- https://doi.org/10.1209/epl/i1999-00309-6
Abstract
The glass transition temperature Tg and the temperature Tα corresponding to the peak in the dielectric loss due to the α-process have been simultaneously determined as functions of the film thickness d through dielectric measurements for thin films of polystyrene. A decrease of Tg was observed with decreasing film thickness, while Tα was found to remain almost constant for d > dc and decrease drastically for d < dc. Here, dc is a critical thickness dependent on molecular weight. The thickness dependence of Tg is related to the distribution of the relaxation times of the α-process, not to the relaxation time itself.Keywords
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