期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 48, 期 12, 页码 2564-2570出版社
JOHN WILEY & SONS INC
DOI: 10.1002/pola.24034
关键词
atom transfer radical polymerization (ATRP), azo polymers; azobenzene, lower critical solution temperature, photoresponsive, pH-responsive; single-electron transfer living radical polymerization, stimuli-responsive polymer, stimuli-sensitive, polymers, thermoresponsive, water-soluble polymers
资金
- National Natural Science Foundation of China [20134020]
- Shandong Province of China [2008001]
- Shandong Jiaotong University of China [Z200802]
Novel water-soluble triply-responsive homopolymers of N,N-dimethylaminoethyl methacrylate (DMAEMA) containing an azobenzene moiety as the terminal group were synthesized by atom transfer radical polymerization (ATRP) technique The ATRP process of DMAEMA was initiated by an azobenzene derivative substituted with a 2-bromoisobutyryl group (Azo-Br) in the presence of CuCl/Me(6)TREN in 1,4-dioxane as a catalyst system The molecular weights and their polydispersities of the resulting homopolymers (Azo-PDMAEMA) were characterized by gel permeation chromatography (GPC). The homopolymers are soluble in aqueous solution and exhibit a lower critical solution temperature (LCST) that alternated reversibly in response to Ph and photoisomerization of the terminal azobenzene moiety It was found that the LCST increased as pH decreased in the range of testing. Under UV light irradiation, the trans-to-cis photoisomenzation of the azobenzene moiety resulted in a higher LCST, whereas it recovered under visible light irradiation This kind of polymers should be particularly interesting for a variety of potential applications in some promising areas, such as drug controlled-releasing carriers and intelligent materials because of the multistimuli responsive property (C) 2010 Wiley Periodicals, Inc J Polym Sci Part A Polym Chem 48 2564-2570, 2010
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