在大孔氧化铝载体上原位制备具有三维孔道的MCM-48中孔膜,并研究了合成溶胶pH值的变化和膜的形成过程.采用XRD,SEM,气体渗透测试等手段对膜材料的表面形貌,结构和气体渗透性能进行表征,并初步探讨了在大孔载体上成膜的机理.结果表明:载体的大孔、膜的合成次数等因素对形成较为完整的中孔膜影响较大.由于载体孔径较大,担载膜层内部应力随着合成次数的增加也逐渐累积.三次合成的膜有较好的形貌结构和渗透性能,而多于三次的合成膜体开始出现裂纹,致使不能更深的提高膜渗透性能;同时在碱性合成溶胶的影响下,在膜组装的界面处,除了存在无机前躯体与模板剂的自组装过程,同时也存在原膜层的部分解聚,因而,虽然膜的致密性随合成次数的增加而增大,而膜厚度却增加很少.
The MCM-48 membranes were formed on the supports with large pore size.The pH value of the synthesis solution and the process of the membrane formation were investigated.The membrane was character-ized by the XRD, SEM and soap-films flow meter.The results showed that the factors including the large pore size of the supports and the times of hydrothermal synthesis play an important role in the compactness of the membrane.The stress in the membrane was increased with increasing the times of synthesis at the presence of large pore size.The membrane could gain relatively good morphology and performance with optimum times of synthesis.But with too much synthesis the membrane tended to be crack.At the same time in the high alkaline solution, there present not only the self-assembly of the inorganic precursor and the surfactant, but also the partly depolymerization of the in- suit membrane.As a result, the membrane could not grow much thicker and thicker with increasing the times of synthesis.
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