Light induced stress rate effects in azobenzene liquid crystal polymer networks

Hongbo Wang; William S. Oates

doi:10.1117/12.883154

27 April 2011 Light induced stress rate effects in azobenzene liquid crystal polymer networks

Hongbo Wang, William S. Oates

Proceedings Volume 7978, Behavior and Mechanics of Multifunctional Materials and Composites 2011; 79780F (2011) https://doi.org/10.1117/12.883154
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

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.

Citation Download Citation

Hongbo Wang and William S. Oates "Light induced stress rate effects in azobenzene liquid crystal polymer networks", Proc. SPIE 7978, Behavior and Mechanics of Multifunctional Materials and Composites 2011, 79780F (27 April 2011); https://doi.org/10.1117/12.883154

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KEYWORDS

Liquid crystals

Polymers

Absorption

Light emitting diodes

Data modeling

Glasses

Blue light emitting diodes

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