Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Focus: Field Controllable Functional Polymers I
CPP 2.2: Vortrag
Montag, 16. März 2015, 10:00–10:15, C 264
Light-induced deformation of azobenzene-containing LC networks — •Vladimir Toshchevikov1, Tatiana Petrova1,2, and Marina Saphiannikova1 — 1Leibniz-Institut für Polymerforschung Dresden e.V. — 2Cherepovets State University, Russia
Azobenzene containing polymer networks belong to a class of smart materials, which are able to change their shape under light illumination. The photomechanical behavior of these materials is very sensitive to their chemical structure [1, 2]. In the present study we develop a theory of light-induced deformation of two-component polymer networks, which contain azobenzene chromophores and liquid crystalline (LC) mesogens. It is shown that preferential reorientation of chromophores perpendicular to the polarization direction leads to the reorientation of the mesogens due to LC interactions between the components. Reorientation of the chromophores and mesogens results in the light-induced deformation of the polymer network. The magnitude of deformation increases with increase of the volume fraction of chromophores and the strength of LC interactions between the components. Influence of the dilution of azobenzene networks by the bent cis-isomers of the chromophores on the light-induced deformation is discussed.
[1] V. Toshchevikov et al. J. Phys. Chem. B 116 (2012), 913; 118 (2014) 12297.
[2] V. Toshchevikov et al. J. Chem. Phys. 137 (2012), 024903.