Title

Relaxation Dynamics of Rubbed Polystyrene Thin Films

Publication Title

Europhysics Letters

Publication Date

9-15-2000

Document Type

Article

DOI

10.1209/epl/i2000-00388-9

Disciplines

Physics

Abstract

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 (Tg) of the films. Results showed reductions of 15-20 K in Tg 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.

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