莫来石纤维增强疏水SiO2气凝胶的制备

Preparation of Hydrophobic Silica Aerogels Heat Insulation Composites Reinforced by Mullite Fiber

以正硅酸乙酯(TEOS)为硅源,三甲基氯硅烷(TMCS)为改性剂,经老化、表面疏水改性,常压干燥制备了莫来石纤维增强SiO2气凝胶隔热材料。用FT-IR、SEM、TG-DSC对其疏水特性及结构进行表征。结果表明:经常压干燥制备的莫来石纤维增强SiO2气凝胶隔热材料,微观上具有典型的气凝胶结构特征,宏观上保持其功能材料的完整性。

Hydrophobic silica aerogels heat insulation composites reinforced by mullite fiber （HSARMF） were prepared by using tetraethyoxysilane （TEOS） as silicon source and trimethylchlorsilane （TMCS） as modifying solvent via sol - gel process. Aging and surface modification were used to get hydrophobic silica aerogels heat insulation composites dried at ambient pressure. The hydrophobic property and mierostructure of silica aerogels were tested by FT - IR, SEM and TG - DSC. The hydrophobic silica aerogels heat insulation composites reinforced by mullite fiber dried at ambient pressure have a typical aerogel microstructure and intact macrostrcture.