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机构地区:[1]天津大学化工学院,天津300072 [2]天津大学药学院,天津300072
出 处:《化学工业与工程》2004年第5期337-339,共3页Chemical Industry and Engineering
摘 要:采用分散聚合法制备了单分散脲醛树脂 Fe2O3 SiO2的复合微球,研究了不同的反应条件对于复合微球的分散状况和粒径大小的影响。该微球在马弗炉内灼烧后,脲醛树脂成分被除去,得到Fe2O3 SiO2的复合微球,其中的Fe2O3组分一部分转化为磁性γ-Fe2O3。由脲醛树脂 Fe2O3 SiO2复合微球的电镜(SEM)图、Fe2O3 SiO2复合微球的XRD衍射图得知该微球为多孔的磁性复合微球,且具有单分散性。Monodisperse microshperes consisting of urea-formaldehyde(UF) resins,Fe_2O_3 and SiO_2 were prepared by dispersion polymerization.Different influences on the dispersive extent and the magnitude of the microshperes in different conditions were investigated.The composite microspheres were then submitted for heat treatment to burn out the polymer template and render the remaining particles magnetizable.In this process α-Fe_2O_3 was partly transformed into γ-Fe_2O_3.SEM micrograph of the UF resins/Fe_2O_3/SiO_2 microspheres and XRD spectrum of the Fe_2O_3/SiO_2 microspheres showed that the Fe_2O_3/SiO_2 microspheres were porous,monodisperse and magnetizable.
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