摘要
采用溶胶 -凝胶法 ,以正硅酸乙酯 (TEOS)为前驱体 ,以不同分子量的聚乙二醇 (PEG)为改性剂 ,制备结构可控的多孔 Si O2 干凝胶 .结果表明 :PEG限制了 TEOS的水解反应 ,进而对溶胶粒子的表面进行修饰 ,形成“粒子团 -PEG”聚集体及短程有序的环状网络结构 ,由此对 Si O2 干凝胶的结构性质进行调控 .经真空热处理后 ,PEG等有机残留物被脱除的同时 ,Si O2 -PEG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 SiO_2 xerogels with controlled structure were obtained from TEOS in the presence of PEG by sol-gel method. The results showed that PEG restrained the hydrolysis reaction of TEOS, and then modified the surface of sol particle to form the PEG-clusters (i.e. the ring-like networks in short order). As a result, the addition of PEG could adjust the texture properties of SiO_2 xerogels. It has been found that the SiO_2 xerogel has a stronger flexible skeleton, narrower pore distribution, and higher thermal stability with the removal of the residue organic(such as PEG and so on) by vacuum heat-treatment.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期95-98,共4页
Chemical Journal of Chinese Universities
基金
国家杰出青年科学基金!(批准号 :2 96 2 530 7)资助
关键词
溶胶-凝胶
二氧化硅
干凝胶
SiO_2-PEG
Pore distribution
Controlled structure
Sol-Gel
