Local dielectric spectroscopy of near-surface glassy polymer dynamics

Details Local dielectric spectroscopy of near-surface glassy polymer dynamics Local dielectric spectroscopy of near-surface glassy polymer dynamics

2007-07-12

arxiv.org/abs/0707.1803v1

Physics

Condensed Matter

Soft Condensed Matter

submitted

Scientific paper

10.1063/1.2825301

A non-contact scanning-probe-microscopy method was used to probe local near-surface dielectric susceptibility and dielectric relaxation in poly-vinyl-acetate (PVAc) near the glass transition. Dielectric spectra were measured from 10-4 Hz to 102 Hz as a function of temperature. The measurements probed a 20 nm thick layer below the free-surface of a bulk film. A small (4 K) reduction in glass transition temperature and moderate narrowing of the distribution of relaxation times was found. In contrast to results for ultra-thin-films confined on or between metallic electrodes, no reduction in the dielectric strength was found, inconsistent with the immobilization of slower modes.

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