Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 23: Poster: Polymer Dynamics
CPP 23.12: Poster
Wednesday, March 28, 2012, 11:00–13:00, Poster A
Light-induced deformation of amorphous azo-polymers: structure-property relation — Vladimir Toshchevikov1, Jaroslav Ilnytskyi2, and •Marina Saphiannikova1 — 1Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany — 2Institute for Condensed Matter Physics, Lviv, Ukraine
Recently, we have proposed a microscopic theory [1] of light-induced deformations in amorphous side-chain azo-polymers. The theory is able to predict a sign of the sample deformation (contraction/elongation) depending on angular distributions of chromophores in respect to the backbone. For instance, it is shown that an azo-polymer demonstrates a uniaxial elongation along the polarization vector of the light, if azobenzenes are attached to a stiff backbone and have preferable orientation perpendicular to it. This kind of behavior has been indeed observed in molecular dynamics simulations of azo-polymers with short spacers [2]. The present contribution is aimed to relate quantitatively the theoretical and simulation studies by feeding certain structural properties obtained in the simulations into a theory input. Especially, the backbone rigidity and angular distribution of chromophores have been studied at different light intensities and temperatures. This work may open a way for fine tuning of photomechanical properties of azo-polymers by modifying their chemical structure.
This work was supported by the DFG grant GR 3725/2-1.
[1] V.Toshchevikov, M.Saphiannikova, G.Heinrich. J. Phys. Chem. B 2009, 113, 5032; [2] J. Ilnytskyi, D. Neher, M. Saphiannikova. J. Chem. Phys. 135, 044901 (2011).