Journal
COLLOID AND POLYMER SCIENCE
Volume 285, Issue 14, Pages 1607-1615Publisher
SPRINGER
DOI: 10.1007/s00396-007-1735-4
Keywords
polymer composite microspheres; core-shell; multiresponsive
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Fe3O4/SiO2/poly (N-isopropylacrylamide-co-N,N-dimethylaminoethyl methacrylate) [P(NIPAM-co-DMA)] multiresponsive composite microspheres with core-shell structure were synthesized by template precipitation polymerization. First, the magnetite nanoparticles were coated with silica and then modified with 3-(trimethoxysilyl)-propyl methacrylate (MPS). Subsequently, the Fe3O4/SiO2 particles grafted with MPS were used to seed the precipitation copolymerization of NIPAM and DMA. The composite microspheres with core-shell structure were superparamagnetic, pH-sensitive, and thermoresponsive. The swelling ratio (D-25 degrees C,D- (pH = 3)/D-50 degrees C,D- (pH = 9))(3) coupling of pH and temperature increased up to 21.2, which was much higher than that without comonomer DMA.
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