Volume 46, Number 5, June I 1999
|Page(s)||649 - 654|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Glass transition temperature and dynamics of α-process in thin polymer films
Faculty of Integrated Human Studies,
Kyoto University - Kyoto, 606-8501 Japan
Accepted: 30 March 1999
The glass transition temperature Tg and the temperature 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 was found to remain almost constant for and decrease drastically for . 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.
PACS: 64.70.Pf – Glass transitions / 68.60.-p – Physical properties of thin films, nonelectronic / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, 1999
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.