Reversible photo- and thermoresponsive, self-assembling azobenzene containing zwitterionic polymers

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Reversible photo- and thermoresponsive, self-assembling azobenzene containing zwitterionic polymers
Title:
Reversible photo- and thermoresponsive, self-assembling azobenzene containing zwitterionic polymers
Other Titles:
Langmuir
Publication Date:
13 August 2018
Citation:
Vasantha, V. A.; Chen, J. H.; Zhao, W. G.; Herk, A. M. V.; Parthiban, A., Reversible photo- and thermoresponsive, self-assembling azobenzene containing zwitterionic polymers. Langmuir 2019, 35 (5), 1465-1474.
Abstract:
Commercially available azo dyes bearing amino groups were grafted to zwitterionic copolymers composed of cyclic anhydride functionality. The zwitterionic copolymers were prepared for the first time by polymerizing sulfobetaine (SB) monomer with maleic anhydride (MA) under conventional free radical polymerization as well as reversible addition–fragmentation chain transfer (RAFT) polymerization. Poly(SB-co-MA) self-assembled in deionized water. Azobenzene grafted zwitterionic poly((SB-co-MA)-g-Azo) exhibited multiresponsive behavior. As confirmed by UV–vis spectroscopy, trans → cis isomerization of the azo group was responsible for the photo- and thermal responsive behavior. The photoisomerization was reversible, and no photoaging was detected during the repeated exposure to UV and visible light. The water-soluble nature of photoresponsive azo dye grafted copolymers makes it suitable for applications in biological systems.
License type:
PublisherCopyrights
Funding Info:
This work was supported by the PHAROS - Advanced Surfaces Programme of Agency for Science, Technology and Research (A*STAR) (Grant no.: 1523700105).
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.langmuir.8b01820.
ISSN:
0743-7463
1520-5827
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