SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Polymer and Molecular Dynamics, Friction and Rheology
CPP 20.5: Vortrag
Dienstag, 28. März 2023, 10:45–11:00, ZEU 255
Viscoplastic Modeling of Surface Relief Grating Growth on Isotropic and Pre-oriented Azopolymer Films — •Tverdokhleb Nina1, Loebner Sarah2, Santer Svetlana2, and Marina Saphiannikova1 — 1Institute Theory of Polymers, Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany — 2Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany
We report on solving two intriguing issues concerning the inscription of surface relief gratings within azopolymer thin films under irradiation with SS, PP and RL interference patterns. For this, we utilize the orientation approach and viscoplastic modeling in combination with experimental results, where the change in surface topography is acquired in-situ during irradiation with modulated light. First, the initial orientation state of polymer backbones is proved to be responsible for the contradictory experimental reports about the efficiency of the SS interference pattern. Different orientation states can influence not only the phase of SS grating but also its height, which is confirmed experimentally using special pre-treatments. Second, faster growth of gratings inscribed by the RL interference pattern is shown to be promoted by a weak photo-softening effect. Overall, the modeled results are in good agreement with the order of relative growth efficiency: RL-PP-SS.