Dresden 2017 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Photoswitchable Materials
CPP 27.1: Talk
Tuesday, March 21, 2017, 14:00–14:15, ZEU 114
Kinetics of light-induced ordering and deformation in LC azobenzene-containing materials — •Vladimir Toshchevikov1, Tatiana Petrova2, and Marina Saphiannikova1 — 1Leibniz-Institut für Polymerforschung, Hohe Str. 6, 01069 Dresden, Germany — 2Cherepovets State University, pr. Lunacharskogo 5, 162600 Cherepovets, Russia
Azobenzene-containing materials are known as effective actuators of the light energy into mechanical work [1]. We develop a theory of light-induced ordering and deformation in azo-materials starting from kinetic equations of photoisomerization. The orientation interactions between rod-like trans-isomers are taken into account. Angular selectivity of the photoisomerization leads to the light-induced ordering and deformation of the azo-material. The time evolutions of ordering and deformation are found as functions of the light intensity depending on opto-mechanical characteristics of the material: probability of optical excitation of trans- and cis-isomers, angular jump during single isomerization event, viscosity of the material, strength of the orientation interactions and angular distribution of chromophores in side chains. Found structural-property relationships are in agreement with experiments and can be used for construction of light-controllable smart materials for target practical applications.
[1] Petrova T. et al., Soft Matter 11, 3412-3423, 2015.