3种共溶剂对正硅酸乙酯水解的影响

Influence of Three Cosolvents on Hydrolysis of Tetraethyl-orthosilicate

研究正丁醇,异丙醇,乙醇3种不同的共溶剂对正硅酸乙酯水解沉淀过程和溶胶 凝胶过程反应时间和产率的影响·利用红外和透射电子显微镜研究水解得到的二氧化硅的结构和表面形貌·由研究结果发现,无论是正硅酸乙酯水解沉淀过程还是溶胶 凝胶过程,随着共溶剂烷基链的增长,反应时间减少,产率增大·红外结果说明,沉淀过程和溶胶 凝胶过程得到的二氧化硅的结构相同·透射电子显微镜结果表明,不同共溶剂在不同的水解过程中得到的粒子的大小不一样·

Investigates the influence of such cosolvents as n-butanal, isopropanol and ethanol on the reaction time and yield in the precipitation process and sol-gel process of tetraethyl-orthosilicate hydrolysis. The structure and morphology of powdered SiO_2 were studied by TEM and FT-IR. The results showed that the reaction time decreases and yield increases with the increase in alkyl chains during either precipitation process or sol-gel process. In addition, the structure of powdered SiO_2 obtained from either process are the same, but the particle sizes of SiO_2 powder obtained from different hydrolysis process in which different cosolvents are used are different, ie. using the cosolvents n-butanol and isopropyl can form smaller particle size than using ethanol.