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Photoinduced cooperative molecular reorientation on azobenzene side-chain-type copolymers

Paper ID Volume ID Publish Year Pages File Format Full-Text
28323 44070 2006 7 PDF Available
Title
Photoinduced cooperative molecular reorientation on azobenzene side-chain-type copolymers
Abstract

In order to improve the value of photoinduced birefringence and the long-term stability of azobenzene copolymer, two series of azobenzene side-chain-type copolymers consisting of two repeating units, one bearing cyanoazobenzene (or cyanoazopyridine) and the other bearing a long π-conjugated chromophore (bisazobenzene), have been synthesized and compared with respect to their photoinduced birefringence characteristics. Consequently, a fairly large value (observed highest value was 0.244) and superior stability (initial relaxation value was less than 0.2%) of photoinduced birefringence have been achieved. Furthermore, unusual behavior of the photoinduced birefringence depending on the copolymerization ratio of the two chromophores has been found, i.e., a sharp peak of the photoinduced birefringence has been observed at a copolymerization ratio of around 50:50 mol%. This phenomenon could be attributed to mutual promotion of the photoinduced molecular reorientation process, that is cooperative molecular motion, taking place at a specific stoichiometric composition ratio of the two chromophores.

Keywords
Photoinduced cooperative motion; Molecular reorientation; Azobenzene copolymer; Photoinduced birefringence; Holographic data storage
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Photoinduced cooperative molecular reorientation on azobenzene side-chain-type copolymers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 183, Issue 3, 25 October 2006, Pages 273–279
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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