中文摘要：

以双（三乙氧基硅基）甲烷（BTESM）、1,2-双（三乙氧基硅基）乙烷（BTESE）和1,8-双（三乙氧基硅基）辛烷（BTESO）为前驱体,采用聚合溶胶路线制备有机无机杂化SiO2溶胶。研究了前驱体浓度和水解比对3种聚合溶胶状态、溶胶尺寸及分布的影响,并采用热重/差示扫描量热和CO2吸附方法对有机无机杂化SiO2粉体的性能进行了分析。利用单组分气体渗透实验对BTESM、BTESE、BTESO微孔膜进行了表征,结果表明：在测试温度200℃、0.3MPa压力条件下,BTESM膜的H2渗透率为5.6×10–7mol·m–2·s–1·Pa–1,H2/CO2、H2/N2和H2/CH4的理想分离因子分别为6.1,26.7和50.9;随着倍半硅氧烷前驱体中桥联烷基碳原子数的增加,有机无机杂化Si O2膜对单组分N2、CH4和SF6气体的渗透率增大。

英文摘要：

Organic-inorganic hybrid silica sols based on bis（triethoxysilyl）methane （BTESM）, 1, 2-bis（tfiethoxysilyl）- ethane （BTESE） and 1, 8-bis（triethoxysilyl）octane （BTESO） were prepared via a polymeric sol-gel process. The effects of precursor concentration and hydrolysis ratio on the properties （i. e. state, average particle size and particle size distribution） of three kinds of polymeric sols were also investigated. The properties of the organic-inorganic hybrid SiO2 powders were characterized by thermo-gravimetric/differential scanning calorimeter analysis （TG/DSC） and CO2 adsorption. The gas separation performance of BTESM, BTESE and BTESO membranes was evaluated via single gas permeation experiments. At 200℃ and 0.3 MPa, the BTESM membrane has a H2 permeance of 5.6×10^-7 mol/（m2.s·Pa）, and the permselectivities for H2/CO2, H2/N2 and H2/CH4 are 6.1, 26.7 and 50.9, respectively. Moreover, the N2, CH4 and SF6 permeances of the organic-inorganic hybrid SiO2 membranes increase as the number of carbon atoms in the alkane bridge of silsesquioxanes increases.