Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 15: Special techniques
CPP 15.5: Vortrag
Montag, 7. März 2005, 17:30–17:45, TU C230
Astonishingly long ranged mechanical interphases at polymer/solid boundaries — •U. Müller1,2, D. Liebschner1,2, M. Sander1,2, R. Bactavatchalou1,2, R. Sanctuary1,3, W. Possart1 und J.K. Krüger1,2 — 1Laboratoire Européen de Recherche Universitaire : Saarland-Lorraine — 2Experimentalphysik, Universität des Saarlandes, Bau 38, D-66041 Saarbrücken — 3Laboratoire de Physique des Matériaux, Campus Luxembourg-Limpertsberg, L-1511 Luxembourg
Boundaries between a reactive polymer system, in our case an epoxy, and solid substrates modify the mechanical properties of the polymer in the interface-near region. The so created interphases are of unexpected width up to several hundred micrometers. For the understanding of the overall mechanical properties of such polymer compounds it is of special importance to know the spatial variations of the elastic properties inside the bond material. The spatial mapping of the mechanical properties was performed by high resolution Brillouin microscopy. Our investigations show that width and shape of theses interphases depend strongly on the kind of polymer system, the substrate material and preparation conditions. Possible origins of the creation of elastic interphases are mechanical stresses due to polymerisation shrinkage or diffusive transport of chemical specimens.