Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 46, Issue 18, Pages 1952-1965Publisher
WILEY
DOI: 10.1002/polb.21531
Keywords
creep; creep compliance; glass transition; mechanical properties; membrane inflation; nanomechanics; rheology; rubbery compliance; thin films; ultrathin polymer films; viscoelasticity
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A novel microbubble inflation method has been used to determine the creep compliance of poly(vinyl acetate) and polystyrene ultra-thin films (13-300 nm thick) at temperatures from below to above the glass temperature. We present results that suggest that time-temperature and time-thickness superposition hold in the glassy relaxation regime. Although time-temperature superposition is found for the entire response curve for each thickness, we also find that time-thickness superposition fails as the long-time compliance is approached. This effect occurs because of a strong stiffening as the film thickness decreases. We also show first evidence of stiffening in the glassy regime of free standing films of polystyrene. (C) 2008 Wiley Periodicals, Inc.
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