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Proceedings Paper

Rate dependent modeling, experimental validation, and uncertainty quantification of photostrictive polymers
Author(s): William Oates; Sadiyah S. Chowdhury; Matthew Worden; Dennice Roberts
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Paper Abstract

Polyimide-based azobenzene polymer networks have demonstrated superior photomechanical performance over more conventional azobenzene-doped pendent and cross-linked polyacrylate networks. These materials exhibit larger yield stress and glass transition temperatures and thus provide robustness for active control of adaptive structures directly with polarized, visible light. Here we develop a constitutive modeling framework and experimentally quantify both the photomechanical and theromechanical coupling in these materials. Whereas photochemical reactions clearly lead to deformation, as indicated by a rotation of a linear polarized light source, temperature and viscoelasticity can also influence deformation and complicate interpretation of the photostrictive constitutive behavior. The rate dependent deformation induced by these two effects is quantified experimentally through photomechanical stress measurements and infrared camera measurements. The results are compared to a model that includes both rate dependent deformation as a function of the optically active azobenzene molecules, coupling to the polymer network viscoelasticity, and thermal expansion. Bayesian statistics is utilized to elucidate the differences in thermomechanical and photomechanical deformation and the influence of viscoelasticity on light induced shape memory effects.

Paper Details

Date Published: 11 April 2017
PDF: 12 pages
Proc. SPIE 10165, Behavior and Mechanics of Multifunctional Materials and Composites 2017, 1016515 (11 April 2017); doi: 10.1117/12.2263676
Show Author Affiliations
William Oates, Florida A&M Univ. (United States)
Florida State Univ. (United States)
Sadiyah S. Chowdhury, Florida A&M Univ. (United States)
Florida State Univ. (United States)
Matthew Worden, Florida A&M Univ. (United States)
Florida State Univ. (United States)
Dennice Roberts, Florida A&M Univ. (United States)
Florida State Univ. (United States)


Published in SPIE Proceedings Vol. 10165:
Behavior and Mechanics of Multifunctional Materials and Composites 2017
Nakhiah C. Goulbourne, Editor(s)

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