隔热材料的纳米成型与性能分析

经不同工艺和过程制备二氧化硅气凝胶,初步摸索出制备温度、溶剂、催化剂、反应时间最佳参数.在分析气凝胶干燥开裂的原因后,以三甲基氯硅烷(TMCS)为表面修饰剂,正己烷为干燥介质的表面改性工艺,一定程度控制了气凝胶的干燥收缩和开裂.在室温、常压下的通过不同的改性方案制备出四种不同气凝胶样品,揭示了改性条件、干燥温度对于气凝胶孔隙分布、微观结构的影响.

PREPARATION AND PERFORMANCE STUDY OF NANO-POROUS SUPER-INSULATOR MATERIALS

The factors that influence silica aerogel preparations were investigated,and the optimum values were obtained for preparing temperature,solvent,catalyst and process duration.Silica aerogel crazing was analyzed and some improvements were made using TMCS surface modification technique together with the drying media of normal-hexane to control the crazing.At the room temperature and atmosphere pressure,aerogel was prepared employing four different schemes.The relations between modification methods,drying temperature and pore distributions,nano-structures were discussed.