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Proceedings Paper

Photo-responsive and thermoreversible networks from the self-assembly of azobenzene-containing liquid crystal triblock copolymers (Conference Presentation)

Paper Abstract

We report the synthesis of azobenzene-containing coil-liquid crystal-coil triblock copolymers that can serve as mechano-optic actuators for applications that include non-invasively steering fiber optics. The coil (polystyrene) end-blocks phase segregate from the liquid crystal midblock forming of uniform and uniformly-spaced physical crosslinks, resulting in highly reproducible and thermoreversible networks by self-assembly. These polymers are elastic in the melt (at room temperature) and can be easily spun, coated or molded. Mechanical stretching results in a temporary monodomain alignment. Starting from identical triblock prepolymers (with polystyerene end blocks and 1,2-polybutadiene midblocks), a matched pair (azobenzene-containing, and non-azobenzene-containing) of liquid crystal triblock copolymers was synthesized. These triblocks were then be blended to prepare a series of elastomers with 0 to 5% azobenzene groups, while matching in nearly all other physical properties (cross-link density, modulus, birefringence, etc.), allowing the effect of concentration of photo-responsive groups to be unambiguously determined. Results will be presented that demonstrate this approach to independent control of optical density and photo-mechanical sensitivity.

Paper Details

Date Published: 3 November 2016
PDF: 1 pages
Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390B (3 November 2016); doi: 10.1117/12.2238494
Show Author Affiliations
Zuleikha Kurji, California Institute of Technology (United States)
Washington State Univ. (United States)
Julia A. Kornfield, California Institute of Technology (United States)
Mark G. Kuzyk, Washington State Univ. (United States)

Published in SPIE Proceedings Vol. 9939:
Light Manipulating Organic Materials and Devices III
Joy E. Haley; Jon A. Schuller; Manfred Eich; Jean-Michel Nunzi, Editor(s)

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