Abstract

We describe direct observations of molecular cooperativity near the glass transition in poly-vinyl-acetate (PVAc), through nanometer-scale probing of dielectric fluctuations. Molecular clusters switched spontaneously between two to four distinct configurations, producing complex random-telegraph-signals (RTS). Analysis of the RTS and their power spectra shows that individual clusters exhibit both transient dynamical heterogeneity and non-exponential kinetics.

Notes

Originally posted at http://arxiv.org/abs/cond-mat/0012245. Preprint of an article published in Nature v.408 no.695, 2000.

Keywords

disordered systems, neural networks, molecular cooperativity, polyvinyl acetate, PVAc, dielectric fluctuations

Subject Categories

Condensed matter, Glass transition temperature

Disciplines

Physics

Publication Date

2000

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Physics Commons

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