采用溶胶凝胶法, 以二甲基二乙氧基硅烷/正硅酸乙酯的复合醇盐为前驱体, 制备了一种厚度达到30 μm～500 μm的大尺寸无载体膜, 膜体显示了良好的的可弯曲性和成膜性能, 原子力显微镜表征得到的表面平均粗糙度为0.3 nm, 色质连用谱的分析表明在醇盐水解聚合过程中形成了大量［(CH3)2Si-O］n环状分子, 填充凝胶孔隙, 降低毛细管应力, 增加结构柔韧性。

A large size self-sustained film with considerable thickness ranging from 30 μm to 500 μm was prepared through sol-gel method by adopting dimethyldiethoxysilane/tetraethoxysilane composite material as precursors. The film exhibits satisfactory plasticity and film forming capability as well. AFM (Atomic Force Microscope) investigation of the film surface showes a mean roughness of 0.3 nm. Gas chromatogram/mass spectrum analysis indicates that a large amount of ［(CH3)2Si-O］n molecules were formed during the hydrolysis and condensation processes. These molecules act as space filler within the gel network. Such filler not only leads to the structural flexibility and plasticity of the film, but also inducess the substantial decrease of the capillary forces and shrinkage in the film.