二氧化硅气凝胶最佳表面改性条件的研究

Studies on the Optimal Surface Modification Conditions of Silica Aerogels

采用共前躯体法和衍生法两种改性方法,选用甲基三甲氧基硅烷、三甲基氯硅烷、六甲基二硅烷三种疏水试剂,对二氧化硅气凝胶的表面改性进行了研究.结果表明,选用三甲基氯硅烷为疏水试剂通过衍生法在浓度为10%(V/V)改性12 h得到的二氧化硅气凝胶物理性能和疏水性能良好.

Surface modification of silica aerogels had been studied with the methyltrimethoxysilane, hexamethyldisi-lazane, trimethylchlorosilane as the hydrophobic reagents by two methods：co-precursor and derivatization methods. The results showed that the silica aerogels which modified with trimethylchlorosilane by derivatization method had better physical properties and hydrophobic properties, and the optimal modified concentration, modified time were 10% （v/v） and 12 h respectively.