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Moldable photo-responsive elastomers from thermoreversible networks formed by triblock copolymer selfassembly

Kurji, Zuleikha and Bernhardt, Elizabeth and Kuzyk, Mark G. and Kornfield, Julia A. (2017) Moldable photo-responsive elastomers from thermoreversible networks formed by triblock copolymer selfassembly. In: 253rd American Chemical Society National Meeting & Exposition, April 2-6, 2017, San Francisco, CA.

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Photo-responsive soft materials that retain the responsive optical anisotropy of liq. crystals can serve as mechano-optic actuators for applications that include non-invasively steering fiber optics for biomedical applications. Here we report that reproducible thermoreversible networks are formed by self-assembly of coil-liq. crystal-coil triblock copolymers: the coil (polystyrene) end-blocks phase segregate from the liq. crystal midblock, forming of uniform and uniformly-spaced phys. crosslinks, These polymers are elastic in the melt (at room temp.) and can be easily molded into desired shapes. Starting from identical triblock prepolymers (with polystyerene end blocks and 1,2-polybutadiene midblocks), a matched pair (3% azobenzene, and no azobenzene) of liq. crystal triblock copolymers was synthesized. These triblocks were then blended to prep. a series of elastomers with 0 to 3% azobenzene groups, while matching in nearly all other phys. properties (cross-link d., modulus, birefringence, etc.), and photo-response was quant. measured, allowing us to isolate the effect of concn. of photo-responsive azobenzene groups on photo-response.

Item Type:Conference or Workshop Item (Paper)
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Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2017 American Chemical Society.
Record Number:CaltechAUTHORS:20170503-125111530
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77159
Deposited By: Tony Diaz
Deposited On:03 May 2017 19:54
Last Modified:03 Oct 2019 17:54

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