Journal
APPLIED SURFACE SCIENCE
Volume 254, Issue 16, Pages 5170-5174Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2008.02.021
Keywords
magnetic nanoparticles; surface free radical polymerization; thermosensitive
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Copolymer brushes growing onto magnetic nanoparticles were prepared by surface chain transfer free radical polymerization. Block copolymer brushes (P(PEGMA)-co-PNIPAAm) consist of poly(ethylene glycol) monomethacrylate (PEGMA) and N-isopropylacrylamide monomer. X-ray photoelectron spectroscopy (XPS) characterized the chemical composition of copolymer. Thermogravimetric analysis (TGA) suggested that the amount of copolymer on magnetic nanoparticles decreased with increasing azodiisobutyronitrile (AIBN). The saturation magnetization decreased significantly with increasing P(PEGMA)-co-PNIPAAm. The thermosensitive point is about 43 degrees C for magnetic nanoparticles with 33.8% P(PEGMA)-co-PNIPAAm. (C) 2008 Elsevier B.V. All rights reserved.
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