【摘要】 选择适当的乳化剂和水解温度以及控制水与乳化剂的摩尔比,采用W/O型微乳液法在聚醚多元醇中通过正硅酸乙酯的水解、缩合反应合成了纳米SiO2。红外光谱法(FTIR)证明纳米SiO2粒子的生成,透射电子显微镜(TEM)显示合成的SiO2微粒呈球状且分散,粒径分布在50~70 nm。研究了反应时间、正硅酸乙酯用量、滴加速度及pH值对纳米SiO2制备的影响。通过实验得知,反应时间2 h左右,24 mL聚醚多元醇中正硅酸乙酯的用量0.9~3.6 mL,在10 min内滴加完毕能达到最佳反应效果。更多还原

【Abstract】 Nanosize SiO₂ particles were prepared using water-in-oil microemulsion method in polyether polyol with hydrolysis and condensation reactions of tetraethyl orthosilicate（TEOS） by means of controlling molar ratio of water to surfactant and selecting moderate hydrolysis temperature.Nanosize SiO₂ particles were characterized by FTIR,TEM.The results indicated that silica particles were spherical,dispersed with size range of 50～70 nm.The effects of reaction time,dosage and dropping velocity of TEOS,pH value of the microemulsion system on the preparation of nanosize SiO₂ particles were studied.更多还原