Title

Relaxation Dynamics of Rubbed Polystyrene Thin Films

Publication Title

Europhysics Letters

Publication Date

9-2000

Document Type

Article

DOI

10.1209/epl/i2000-00388-9

Keywords

Glass Transition Temperature, Polymer Films, Surface, Interface, Behavior

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.

Comments

Copright 2000 Institute of Physics. Available on publisher's website at http://dx.doi.org/10.1209/epl/i2000-00388-9.


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