Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Polymer and Molecular Dynamics, Friction and Rheology

CPP 49.2: Talk

Friday, September 9, 2022, 11:45–12:00, H39

Orientation approach to the light-induced surface relief gratings formation in azopolymer materials — •Nina Tverdokhleb, Bharti Yadav, and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden e. V., PF 120411, 01005 Dresden

The phenomenon of azopolymer deformation giving rise to surface relief gratings (SRG) under the influence of polarized light was discovered two and a half decades ago. Despite the numerous different theoretical approaches to this effect, an accurate representation that would interpret all peculiarities of this phenomenon is absent. At present, the light-induced orientation of polymer backbones looks like the most promising explanation [1]. With help of this orientation approach and the finite element modeling software ANSYS, we simulate the viscoplastic formation of sinusoidal protrusions produced by the applied light-induced stress on the thin azopolymer films. We explain the difference in SRG height for irradiation with various interference patterns. It is found that the mechanical boundary conditions have a crucial impact on the output. The results of our viscoplastic modeling are in good agreement with recent experiments [2]. [1] B. Yadav et al. J. Phys. Chem. B 122 (2019) 2001-2009. [2] B. Yadav, N. Tverdokhleb et al. Macromol. Mater. Eng. (2022) 2100990.