Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 24: Polymer films II

CPP 24.3: Vortrag

Dienstag, 8. März 2005, 15:45–16:00, TU C130

Simulations of Lateral Grating Formation Using Finite Element Method — •P. Mirzoyan, M. Saphiannikova, K. Morawetz, O. Henneberg, and U. Pietsch — Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam

The elastic response of a polymer films containing azobenzene groups has been investigated at the presence of a laterally periodic external force using linear elasticity theory in terms of the finite element (FEM) approach. In particular we are interested to understand the formation of a lateral grating structure in the film, if the azofilm is covered by another polymer film, which is not affected by the external force. We have shown, that the strength of the buried lateral grating depends on the layer thicknesses and on the ratio of share elastic constants of the top layer(1) and azolayer(2). Using Youngs moduli E₁ = 2GPa and E₂ = 1GPa , Poissons ratio υ = 0.4 , mass density ρ = 1.05 g/m³ , and thicknesses h₁ = 300nm , h₂ = 100 nm one can find a completely planar surface of the bi-layer structure with a buried grating in the azo-layer.

The existence of such a system could be confirmed by the experiment.