Abstract: The sol-gel preparation of polytetrafluoroethylene/silicon dioxide (PTFE/SiO2) hydrid materials was investigated. The effect of ethanol on the dispersion of PTFE and SiO2 was also discussed. The formula was designed for a 50 % theoretical SiO2 content in PTFE/SiO2 hybrid materials. The impacts of aging time and aging temperature on the actual content of SiO2 were studied. The results showed that with the elongation of aging time, the content of SiO2 increased. In the first 5 h, the increase was very fast and reached 38.9 % by 48 h. The effect of aging temperature was studied at aging time of 1 h. It showed that with the increasing temperature, the content of SiO2 increased at first and then decreased. The content of SiO2 was 19.8 % when aging temperature was 40 ℃.

Key words: polytetrafluoroethylene, sol-gel process, aging, ethanol, silicon dioxide, hybrid material