SiO_2-AEO凝胶体系的织构特性

Textural Characterization of SiO_2-AEO Xerogels

采用溶胶 凝胶法 ,以正硅酸乙酯 (TEOS)为前驱体 ,用脂肪醇聚氧乙烯醚 (AEO)为改性剂制备结构可控的多孔SiO2 干凝胶.结果表明 :通过调节添加量和聚合度以及溶胶老化时间可以对SiO2 干凝胶织构性质进行有效的调控 ;采用不同的环境气氛对SiO2 AEO干凝胶进行热处理 ,则AEO表现出不同的热稳定性 ;经热处理后 ,AEO等有机残留物被脱除的同时 ,SiO2 AEO干凝胶柔性骨架得到加强 ,孔分布更趋集中 ,干凝胶结构的热稳定性得到进一步提高.

The porous SiO2 xerogels with controlled texture were obtained from TE OS in the presence of AEO by sol gel method.It was found that the addition amou nt and molecular weight of AEO and ageing time of SiO2 AEO sol could adjust the textural properties of SiO2 xerogels,and AEO in the xerogel had different therm al stability when the SiO2 AEO xerogel being heated under different atmospheres .As a result,It has been found that the SiO2 xerogel showed stronger flexible sk eleton,narrower pore distribution,and higher thermal stability after heat treat ment.