期刊
POLYMER
卷 97, 期 -, 页码 533-542出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2016.05.074
关键词
Multi-responsive block copolymer; Carboxylic azobenzene; Micellization induced fluorescence emission; Poly(N-isopropylacrylamide); Thermally-induced fluorescence enhancement
资金
- National Natural Science Foundation of China [51322301, 51573005, 51373021]
- National Research Foundation for the Doctoral Program of Higher Education of China [20120001120112]
- Major Project of Beijing Science and Technology Program [Z141100003814011]
One amphiphilic diblock copolymer poly(NIPAm-b-M6AzCOONa) with well-defined structure was synthesized by RAFT polymerization, in which N-isopropylacrylamide (NIPAM) was introduced as one thermoresponsive unit, and 6-[4-(4-sodium carboxylatephenylazo)phenoxyl]hexyl methacrylate (M6AzCOONa) was designed as pH-, UV-responsive and fluorescent units. The block copolymer was non-fluorescent in good solvent, but showed fluorescence emission when it formed micelle-like structures in water. The acquired fluorescence can be adjusted by UV or pH, which was strongly related to the aggregation tightness and size of the micelles. The block copolymer also showed reversible fluorescent enhancement in a large range of pH value (pH = 3-11) driven by thermally-induced coil-to-globule transition due to the existence of the PNIPAm block, which leads to a more closely-tightened aggregation of azobenzene moieties. These multiple-responsive fluorescence behaviors enable the amphiphilic block copolymer to find its applications for wide-pH-range fluorescence thermometer and fluorescence probe. (C) 2016 Elsevier Ltd. All rights reserved.
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