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Proceedings Paper

Light induced stress rate effects in azobenzene liquid crystal polymer networks
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Paper Abstract

Liquid crystal polymer networks exhibit a large number of field-coupled mechanical characteristics including light induced deformation, flexoelectricity, thermal shape memory, electrostriction, and chemically induced deformation. Light induced deformation has received considerable attention recently due to its unique functionality for morphing structure applications since light can be considered clean energy and electrodes and wiring are not needed for actuation. Azobenzene liquid crystals that are synthesized within a glassy liquid crystal network (LCN) in a main chain configuration are considered here under time-dependent deformation from light stimuli. A photomechanical constitutive model, coupled with viscoelasticity of the host polymer network, is developed and compared with light induced blocked stress measurements using a blue light emitting diode (LED). It is shown that the rate of change of stress in the main chain azobenzene liquid crystal is strongly dependent on the rate of change of the liquid crystal microstructure. Additional comparisons to side chain azobenzene LCNs is modeled and compared with data in the literature which illustrates the importance of viscoelastic creep of the polymer network.

Paper Details

Date Published: 27 April 2011
PDF: 13 pages
Proc. SPIE 7978, Behavior and Mechanics of Multifunctional Materials and Composites 2011, 79780F (27 April 2011); doi: 10.1117/12.883154
Show Author Affiliations
Hongbo Wang, The Florida State Univ. (United States)
William S. Oates, The Florida State Univ. (United States)

Published in SPIE Proceedings Vol. 7978:
Behavior and Mechanics of Multifunctional Materials and Composites 2011
Zoubeida Ounaies; Stefan S. Seelecke, Editor(s)

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