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Proceedings Paper

Unifying relations in polymer photomechanics
Author(s): Jonghoon Bin; William S. Oates
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Paper Abstract

Photoresponsive polymers offer novel methods for morphing applications due to its unique ability to control shape spatially and temporally with light. The constitutive behavior of these materials is complicated by the interactions of time-dependent light fields and molecular conformation changes within the polymer network. This requires applications in non-equilibrium thermodynamics, nonlinear photomechanics, and high fidelity numerical simulations using finite difference/finite element methods. The proposed approach utilizes a set of electronic order parameters to represent light driven molecular conformation changes which are coupled to mechanics of a continuum scale polymer network and time-dependent electromagnetics. The model is applied to explain photoisomerization of azobenzene as it deforms a polymer during different types of light excitation. We consider local surface deformation from laser beams including linearly and circularly polarized lights where the azobenzene liquid crystal microstructure couples to affine deformation of the host polymer network. This local deformation from a laser beam is compared to homogeneous polarized light across the surface of a cantilever film. Non-trivial deformation is predicted and the internal mechanisms associated with bending in different directions is discussed.

Paper Details

Date Published: 1 April 2015
PDF: 12 pages
Proc. SPIE 9432, Behavior and Mechanics of Multifunctional Materials and Composites 2015, 943202 (1 April 2015); doi: 10.1117/12.2084344
Show Author Affiliations
Jonghoon Bin, Florida State Univ. (United States)
William S. Oates, Florida State Univ. (United States)

Published in SPIE Proceedings Vol. 9432:
Behavior and Mechanics of Multifunctional Materials and Composites 2015
Nakhiah C. Goulbourne, Editor(s)

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