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Model photo-responsive elastomers based on the self-assembly of side group liquid crystal triblock copolymers (Presentation Recording)

Kurji, Zuleikha and Kornfield, Julia A. and Kuzyk, Mark G. (2015) Model photo-responsive elastomers based on the self-assembly of side group liquid crystal triblock copolymers (Presentation Recording). In: Light Manipulating Organic Materials and Devices II. Proceedings of SPIE. No.9564. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 95640I. ISBN 978-1-62841-730-2. https://resolver.caltech.edu/CaltechAUTHORS:20160104-130309600

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Abstract

We report the synthesis of azobenzene-containing coil-liquid crystal-coil triblock copolymers that form uniform and highly reproducible elastomers by self-assembly. To serve as actuators to (non-invasively) steer a fiber optic, for example in deep brain stimulation, the polymers are designed to become monodomain “single liquid crystal” elastomers during the fiber-draw process and to have a large stress/strain response to stimulation with either light or heat. A fundamental scientific question that we seek to answer is how the interplay between the concentration of photoresponsive mesogens and the proximity to the nematic-isotropic transition governs the sensitivity of the material to stimuli. Specifically, a matched pair of polymers, one with ~5% azobenzene-containing side groups (~95% cyanobiphenyl side groups) and the other with 100% cyanobiphenyl side groups were synthesized from identical triblock pre-polymers (with polystyerene end blocks and 1,2-polybutadiene midblocks). These can be blended in various ratios to prepare a series of elastomers that are precisely matched in terms of the backbone length between physical crosslinks (because each polymer is derived from the same pre-polymer), while differing in % azobenzene side groups, allowing the effect of concentration of photoresponsive groups to be unambiguously determined.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1006/jcis.1997.537910.1117/12.2186347DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2455946PublisherArticle
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2015 SPIE.
Series Name:Proceedings of SPIE
Issue or Number:9564
Record Number:CaltechAUTHORS:20160104-130309600
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160104-130309600
Official Citation:Zuleikha Kurji ; Julia A. Kornfield and Mark G. Kuzyk " Model photo-responsive elastomers based on the self-assembly of side group liquid crystal triblock copolymers (Presentation Recording) ", Proc. SPIE 9564, Light Manipulating Organic Materials and Devices II, 95640I (October 5, 2015); doi:10.1117/12.2186347; http://dx.doi.org/10.1117/12.2186347
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63332
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:04 Jan 2016 23:17
Last Modified:03 Oct 2019 09:27

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