Preparation and Characterization of a Temperature-sensitive, Magnetic, Water-absorbent Resin Comprising Fe3O4 Nanoparticles and Poly(N-isopropylacrylamide-co-sodium acrylate) Envelope
CHEN Hangchao, ZHANG Suhong, LIU Shengyu, ZHANG Zhiqiang, GUO Jianying
College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024
Abstract: A temperature-sensitive, magnetic, and water-absorbent resin was prepared in this work by copolymerizing N-isopropyl acrylamide and sodium acrylate to envelop the pre-synthesized Fe3O4 nanoparticles, in which the Fe3O4 magnetic nanoparticles were prepared by coprecipitation method, and the envelopment was conducted by free-radical copolymerization in aqueous system. The obtained sample was characterized by X-ray diffraction(XRD), Fourier transform infrared spectrometer(FTIR)and thermal gravimetry(TG). Based on temperature sensitivity, swelling property, and deswelling property, it can be found that the resin possesses good water absorption and temperature sensitivity, as the low critical solution temperature (LCST) and swelling ratio were 50 ℃ and 116.74 g/g, respectively, and water loss in the fine coal was 77.90% at 70 ℃ within 30 min. When the sample was fully swelled by water and treated by ultrasonication for 30 min, only a small amount of Fe3O4 was removed, illuminating a relatively stable magnetic property.
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