4.7 Article

Light-driven fluorescence enhancement of phenylazo indazole-terminated polystyrene

Journal

EUROPEAN POLYMER JOURNAL
Volume 45, Issue 7, Pages 2131-2137

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2009.04.020

Keywords

Azo polymers; Fluorescence; Reversible addition-fragmentation chain transfer (RAFT); Self-assembly

Funding

  1. National Nature Science Foundation of China [20874069, 50803044]
  2. Science and Technology Development Planning of Jiangsu Province [BK2007702, BK2007048]
  3. International Cooperation Foundation of Jiangsu Province [BZ2007037]
  4. Nature Science Key Basic Research of Jiangsu Province for Higher Education [05KJA15008]
  5. Qing Lan Project

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The well-defined phenylazo indazole-terminated polystyrene (PS) was successfully prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization of styrene (St) mediated by a novel chain transfer agent (CTA) bearing phenylazo indazole moieties in the Z group, benzyl-5-(4-(dimethylamino)phenylazo) indazole-1-carbodithioate (BPCD). The fluorescence emission of BPCD and the phenylazo indazole-terminated PS in chloroform (CHCl3) before and after the 365 nm ultraviolet irradiation was investigated. Interestingly, the fluorescence intensities of BPCD and the phenylazo indazole-terminated PS in CHCl3 were both sensitive to the 365 nm ultraviolet irradiation. The fluorescence intensities of these solutions increased with the irradiation time and reached maximum at 110 min. The light-driven fluorescence enhancement of BPCD and the phenylazo indazole-terminated PS were both attributed to the formation of spherical aggregate originated from the trans-cis isomerization of azobenzene moieties in BPCD and PS chain, which was confirmed by transmission electron microscopy (TEM), H-1 NMR, UV and dynamic light scattering (DLS) spectra. (C) 2009 Elsevier Ltd. All rights reserved.

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