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以低度交联的三聚氰胺甲醛(MF)微球为高分子模板剂,采用正硅酸四乙酯(TEOS)和Ludox AS-40硅溶胶2种硅源,分别经溶胶-凝胶法和静电自组装法,制备了T-MF@SiO_2和A-MF@SiO_2核-壳结构复合微球,再辅助高温煅烧模板法除去MF高分子微球,成功制备了T-SiO_2和A-SiO_2空心球。利用扫描电子显微镜(SEM)、透射电镜(TEM)、傅里叶红外光谱仪(FT-IR)、比表面积孔径分布测定仪(BET)等手段对样品的形貌、结构和组分进行了表征和比较,同时,对介孔SiO_2空心球的形成机理也进行了探讨。结果表明:T-SiO_2空心球和A-SiO_2空心球的粒径尺寸在300~400nm,比表面积分别为425m2/g和297m2/g,两者在壳层的完整性、孔径分布的均一性方面存在差异。
Two kinds of silicon sources, TEOS and Ludox AS-40, were used as template to prepare low-crosslinked melamine formaldehyde (MF) microspheres. Sol-gel and electrostatic T-SiO 2 and A-SiO 2 hollow microspheres were successfully prepared by the self-assembly method and the T-MF @ SiO_2 and A-MF @ SiO_2 core-shell composite microspheres were prepared. . The morphology, structure and composition of the samples were characterized by SEM, TEM, FT-IR and BET. At the same time, the mechanism of the formation of mesoporous SiO_2 hollow spheres was also discussed. The results show that the particle size of T-SiO 2 hollow sphere and A-SiO 2 hollow sphere are in the range of 300-400 nm and the specific surface areas are 425 m 2 / g and 297 m 2 / g, respectively. has a difference.