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Colloid and Polymer Science
Published in: Colloid and Polymer Science 3/2015

01-03-2015 | Original Contribution

Photo-induced dynamic association of coumarin pendants within amphiphilic random copolymer micelles

Authors: Huan Chang, Yan Liu, Mei Shi, Zhaotie Liu, Zhongwen Liu, Jinqiang Jiang

Published in: Colloid and Polymer Science | Issue 3/2015

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Abstract

The water-soluble amphiphilic random copolymer of P(DMA-co-VBC) with coumarin pendants has been designed to investigate the photo-induced dynamic association of coumarin pendants within polymer micelles in aqueous solution. Methods of absorption and emission spectra, solution transmittance, dynamic light scattering (DLS), and atomic force microscope (AFM) were applied. It was found that P(DMA-co-VBC) can form polymer micelles in aqueous solution. The time-dependent photo-dimerization degree (PD) of polymer micelles upon different intensity irradiations of 320 nm light showed saturating behaviors with an intensity-independent value of the maximum photo-dimerization extent, while the maximum photo-cleavage extent of coumarin dimers declined with the increasing intensity of 254 nm irradiation at used conditions. Furthermore, a significant emission band at 445 nm (I 2 ) evidently emerged as against the disappearance of emission band at 385 nm (I 1) during the photo-dimerization, and the time-dependent I 2 /I 1 ratios of polymer aqueous solution upon alternative irradiations of 320 and 254 nm light showed a wave-like increase as a function of irradiation cycles, indicating a wavy closeness of coumarin pendants within polymer micelles during the reversible photo-dimerization cycles.
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Appendix
Available only for authorised users
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Metadata
Title
Photo-induced dynamic association of coumarin pendants within amphiphilic random copolymer micelles
Authors
Huan Chang
Yan Liu
Mei Shi
Zhaotie Liu
Zhongwen Liu
Jinqiang Jiang
Publication date
01-03-2015
Publisher
Springer Berlin Heidelberg
Published in
Colloid and Polymer Science / Issue 3/2015
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-014-3474-7

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