Journal
EUROPEAN POLYMER JOURNAL
Volume 46, Issue 11, Pages 2120-2128Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2010.09.001
Keywords
Photo-cross-linking; Nanogel; Nanoreactor; Micelle; Gold nanoparticles
Categories
Funding
- Natural Science Foundation of China [NSFC - 20774082, 50830106]
- National Science Fund for Distinguished Young Scholars [51025012]
- Programs Foundation of Ministry of Education of China [20070335024]
- State Key Laboratory of Supramolecular Structure and Materials [SKLSSM200911]
- Natural Science Foundation of China of Zhejiang Province [Y4080250]
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Reversibly photo-cross-linkable pH-responsive block copolymer poly(ethylene oxide)-b-poly((2-(diethylamino)ethyl methacrylate-co-4-methyl-[7-(methacryloyl)oxyethyloxy]coumarin))(PEO-b-P(DEA-co-CMA)) was synthesized via atom transfer radical polymerization (ATRP) Block copolymer nanogels could be easily prepared by first photo-cross-linking of the micelles at pH > 7 and then adjusting the solution to pH < 7 The photo-crosslinking was proved to be reversibly controlled under alternative irradiation of UV light at 365 nm and 254 nm As a result the cross-linking degrees and sizes of the nanogels can be easily controlled by alternatively UV light irradiation Finally the nanogels can serve as nanoreactors for the synthesis of gold nanoparticles The protonated DEA units were first coordinated with HAuCl4 and then the electrostatically bounded AuCl4- anions were reduced to gold nanoparticles by NaBH4 The nanogel-supported gold nanoparticles were used in chemical catalysis The pH-responsive photo-cross-linked nanogels have been characterized using dynamic light scattering transmission electron microscopy UV-vis spectra and H-1 NMR spectroscopy measurements respectively (C) 2010 Elsevier Ltd All rights reserved
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