【摘要】 添加少量聚乙二醇（PEG）于TEOS－H₂O－C₂H₅OH－NH₄OH溶胶体系中，可以改变SiO₂溶胶粒子的生长过程和网络结构的分形结构。通过小角X光散射（SAXS）、透射扫描电镜（TEM）、激光粒度分布仪（SDP）等手段对这一过程进行分析测试，同时探讨了PEG对SiO₂溶胶－凝胶的修饰机理，有力地证明了分形行为的存在，着重研究了其分数维的变化规律，并提出PEG在该溶胶中的作用模型。更多还原

【Abstract】 PEG was added into TEOS - water - etahanol - ammounia sol system , which could change the particle growth and then tailor the fractal network of the SiO₂ sol. By means of SAXS, ThM and SDP, the effects of PEG on sol partide was discussed and the mechanism on sol partide growing was suggested in terms of sol -gel chemistry , and the fractal behaviors of SiO₂ -PEG sol were proved to be present and the change of the fractal dtansion was studied emphatically , the results showed that PEG additive ldried partcle growth but also accelerated partide agglomeation. It was found that the acton of PEG was similar to that of organic structure -directing agent and made the sol duster cross-linked ring-like network in short order, and the model of the PEG behavior in the SiO₂ sol-gel proass was described. The SiO₂-PEG sol-gel proass was recognized quantitatively at a more essential level.更多还原