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

Kurji, Zuleikha and Kornfield, Julia A. and Kuzyk, Mark G. (2016) Photo-responsive and thermoreversible networks from the self-assembly of azobenzene-containing liquid crystal triblock copolymers. In: Light Manipulating Organic Materials and Devices III. Proceedings of SPIE. No.9939. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 99390B. ISBN 9781510602694. http://resolver.caltech.edu/CaltechAUTHORS:20180723-155342466

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2238494DOIArticle
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2016 Society of Photo-optical Instrumentation Engineers (SPIE).
Record Number:CaltechAUTHORS:20180723-155342466
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180723-155342466
Official Citation:Zuleikha Kurji, Julia A. Kornfield, Mark G. Kuzyk, "Photo-responsive and thermoreversible networks from the self-assembly of azobenzene-containing liquid crystal triblock copolymers (Conference Presentation)", Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390B (3 November 2016); doi: 10.1117/12.2238494; https://doi.org/10.1117/12.2238494
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88146
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Jul 2018 14:49
Last Modified:24 Jul 2018 14:49

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