期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 48, 期 1, 页码 15-23出版社
WILEY
DOI: 10.1002/pola.23716
关键词
atom transfer radical polymerization (ATRP); double hydrophilic; graft copolymers; schizophrenic micellization; single electron transfer-living radical polymerization (SET-LRP)
资金
- National Natural Science Foundation of China [20974117, 20904065, 50873029]
- Shanghai Rising Star Program [07QA14066]
- Shanghai Nano-Technology Program [0952nm0S800]
- Shanghai Scientific and Technological Innovation Project [08431902300]
- Chinese Academy of Sciences
A series of well-defined double hydrophilic graft copolymers, consisting of poly(N-isopropylacrylamide)-b-poly-(ethyl acrylate) backbone and poly(2-vinylpyridine) side chains, were synthesized by successive single-electron-transfer living radical polymerization (SET-LRP) and atom transfer radical polymerization (ATRP). The backbone was prepared by sequential SET-LRP of N-isopropylacrylamide and 2-hydroxyethyl acrylate at 25 degrees C using CuCl/tris(2-(dimethylamino)ethyl)amine as the catalytic system. The obtained diblock copolymer was transformed into the macroinitiator by reacting with 2-chloropropionyl chloride. Next, grafting-from strategy was used for the synthesis of poly(N-isopropylacrylamide)-b-[poly(ethyl acrylate)-g-poly (2-vinylpyridine)] double hydrophilic graft copolymer. ATRP of 2-vinylpyridine was initiated by the macroinitiator at 25 degrees C using CuCl/hexamethyldiethylenetriamine as the catalytic system. The synthesis of both the backbone and the side chains are controllable. Thermo- and pH-responsive schizophrenic micellization behaviors were investigated by H-1 NMR, fluorescence spectroscopy, dynamic light scattering, and transmission electron microscopy. Unimolecular micelles with PNIPAM-core formed in acidic environment (pH = 2) with elevated temperature (T >= 32 degrees C), whereas the aggregates turned into spheres with PEA-g-P2VP-core accompanied with the lifting of pH values (pH >= 5.3) at room temperature. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48:15-23, 2010
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