MDEOS改性SiO2气凝胶的性能研究

he performance of SiO2 aerogel using DMDEOS as a combined precursor was studied in this paper. The effects of different ratios of DMDEOS/TEOS addition on gel time, moisture resistance, volumetric water absorption and water resistance were tested. The results showed that: the gel time parabolic increases with the increase of DMDEOS addition; the moisture resistance increases with the increase of DMDEOS addition，and the long-term thermal conductivity increases about 10% with 1/4 ratio added; Volumetric water absorption and water resistance require a certain amount of DMDEOS addition to have a significant impact. In the experiment, significant improvement was observed with 1/4 ratio addition, while the 1/16 and 1/8 ratio addition both have no significant effect.