N-异丙基丙烯酰胺-丙烯酸钠共聚包覆四氧化三铁温敏磁性吸水树脂的制备与表征

Preparation and Characterization of a Temperature-sensitive,Magnetic,Water-absorbent Resin Comprising Fe_3O_4 Nanoparticles and Poly(N-isopropylacrylamide-co-sodium acrylate) Envelope

通过N-异丙基丙烯酰胺与丙烯酸钠共聚包覆四氧化三铁颗粒制备了温敏磁性吸水树脂。首先采用共沉淀法制备了磁性Fe_3O_4纳米粒子,接着将Fe_3O_4纳米粒子、N-异丙基丙烯酰胺和丙烯酸钠通过水溶液自由基共聚法制备成温敏磁性吸水树脂。利用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和热重分析(TG)对所得样品进行了表征测试。通过温度敏感性、溶胀性能和退胀性能的研究发现,温敏磁性吸水树脂的临界溶解温度(LCST)为50℃左右,溶胀吸水倍率为116.74g/g,70℃下30 min能退去质量分数约为77.90%的水分,表现出了良好的吸水性和温敏性。充分溶胀的温敏磁性吸水树脂经过超声30min后Fe_3O_4含量小幅降低,表明其磁性相对稳定。

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 Fe_3O_4 nanoparticles,in which the Fe_3O_4 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 Fe_3O_4 was removed,illuminating a relatively stable magnetic property.