Glass Transition Temperature and Dynamics of $α$-Process in Thin Polymer Films

Details Glass Transition Temperature and Dynamics of $α$-Process in Thin Polymer Films Glass Transition Temperature and Dynamics of $α$-Process in Thin Polymer Films

1998-10-15

arxiv.org/abs/cond-mat/9810171v1

Europhysics Letters, Vol.46, No.5, pp.649-654 (1999)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1209/epl/i1999-00309-6

The glass transition temperature $T_g$ and the temperature $T_{\alpha}$ corresponding to the peak in the dielectric loss due to the $\alpha$-process have been simultaneously determined as functions of film thickness $d$ through dielectric measurements for thin films of polystyrene. A decrease of $T_g$ was observed with decreasing film thickness, while $T_{\alpha}$ was found to remain almost constant for $d > d_c$ and decrease drastically for $d < d_c$. Here, $d_c$ is a critical thickness dependent on molecular weight. The thickness dependence of $T_g$ is related to the distribution of relaxation times of the $\alpha$-process, not to the relaxation time itself.

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