间苯二酚-甲醛凝胶自发成膜技术研究

 以间苯二酚和甲醛为原料，对水相溶胶-凝胶聚合自发成膜技术获得间苯二酚-甲醛(RF)凝胶薄膜进行了研究。主要研究了溶胶-凝胶过程中冰醋酸（HAC）含量和反应温度对凝胶过程的影响，分析了RF有机凝胶自发成膜的形成机理。IR和SEM分析表明，所得到的凝胶膜具有典型的RF有机气凝胶结构，薄膜厚度大约为50 μm，膜由直径10 μm左右的粒子组成，没有观察到明显的孔洞结构。分析认为，在间苯二酚和甲醛占总溶液的质量分数为67％左右及控制pH值在一定的酸性范围，RF凝胶自发成膜过程和机理可以用RF凝胶的收缩机理加以解释，RF自发膜的表面形貌及形成机理与均匀泡沫的连续相分离机理类似。

Resorcinol-formaldehyde gel self-film technology

Resorcinol-formaldehyde(RF) gel films were synthesized by a series of processes such as sol-gel, supercritical drying and carbonization using resorcinol and formaldehyde. The main factors that affect the properties of aerogels such as HAC content and the reaction temperature were investigated to indicate the mechanism of self-assemble RF films. The micro-morphology and structures of the gel films were characterized by FT-IR and SEM. It was found the thickness of RF aerogel films is about 50 μm , the size of particles about 10 μm and there are no obvious holes. The results show that RF gel self-films form when the mass fraction of resorcinol and formaldehyde in the solution are 67% and the sol is acid. The process and mechanism of RF gel self-films are similar to the process of RF gel and