Regensburg 2004 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 8: Physics of Polymers II

CPP 8.7: Vortrag

Montag, 8. März 2004, 17:15–17:30, H 37

Generalized Cauchy-Relation and its Implications for Amorphous and Nano-Structured Materials — •Jan Kristian Krüger, Thomas Britz, Jörg Baller, Andrä le Coutre, Wulff Possart, Patrick Alnot, and Roland Sanctuary — Laboratoire Européen de Recherche Universitaire Saarland-Lorraine (LERUSL). Universität des Saarlandes, Fakultät für Physik und Elektrotechnik 7.2, Geb. 38, D-66041 Saarbrücken, Germany

The generalized Cauchy-Relation (GCR) shows an unexpected linear transformation (LT) between the elastic stiffness constants c11 and c44 in materials with effective isotropic symmetry. The slope B of this LT is identical to that of the classical Cauchy-relation (B=3) but the additive constant A is far from beeing zero. The magnitude of A will be discussed as a measure of nanostructuration. Astonishingly, the GCR holds true during irreversible processes like the curing process of adhesives.

The thermal glass transition, on the other hand shows two different behaviors of the GCR: on slow cooling, the glass transition is completely hidden in the GCR whereas on fast cooling the parameter B deviates significantly from its classical value. Thus, the GCR is able to distinguish between two states of glasses. Aging drives the broken GCR towards the undisturbed GCR

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