Regensburg 2010 – wissenschaftliches Programm

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SYMR: Symposium Nuclear Magnetic Resonance: from Applications in Condensed-Matter Physics to New Frontiers

SYMR 8: Glasses and Glass Transition

SYMR 8.4: Vortrag

Mittwoch, 24. März 2010, 15:00–15:15, H48

Relaxation Kinetics of Nanoscale Indents in a Polymer Glass — •Armin Knoll, Dorothea Wiesmann, Bernd Gotsmann, and Urs Duerig — IBM Research - Zurich, 8803 Rueschlikon, Switzerland

Nanometer scale indents have been written in a cross-linked polystyrene sample, and their relaxation has been studied at annealing temperatures well below the glass transition of the polymer. The indents represent a highly nonequilibrium state of the polymer which is subjected to mechanical stress of up to 0.4 GPa and thermal quench rates on the order of 108 K/s during writing. It is shown that the relaxation towards equilibrium evolves logarithmically over more than 10 orders of magnitude in time. The relaxation kinetics are accurately described in terms of a thermally activated process with an energy barrier whose magnitude decreases linearly with the distance from equilibrium [1].

[1] A. Knoll, D. Wiesmann, B. Gotsmann, and U. Duerig, Phys. Rev. Lett., 102, 117801 (2009)

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