| Issue |
Europhys. Lett.
Volume 51, Number 6, September II 2000
|
|
|---|---|---|
| Page(s) | 655 - 660 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00388-9 | |
| Published online | 01 September 2002 | |
Relaxation dynamics of rubbed polystyrene thin films
1
Department of Physics and Liquid Crystal Institute Kent State University -
Kent, OH, USA
2
Department of Polymer Science, University of Akron - Akron, OH, USA
Received:
18
January
2000
Accepted:
21
July
2000
Optical retardation measurements were used to probe the chain relaxation
dynamics in rubbed polystyrene films of varying thicknesses on glass substrates.
A model based on Kohlrausch-Williams-Watts relaxation was developed and used
to determine the glass transition temperature 
of the films. Results
showed reductions of 15–20 K in 
for thin films of thicknesses comparable
to the radius of gyration as well as for cast films rubbed with different
strengths. These results provide evidence of a faster relaxation dynamics
relative to the polymer-substrate interface for thinner films and enhanced
chain mobility at the polymer-air interface.
PACS: 68.60.-p – Physical properties of thin films, nonelectronic / 61.20.Lc – Time-dependent properties; relaxation / 64.70.Pf – Glass transitions
© EDP Sciences, 2000
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