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采用硅烷偶联剂,乙烯基三甲氧基硅烷(VTMS)为改性剂,控制改性时间(4h和12h),对全硅沸石进行改性,以聚二甲基硅氧烷(PDMS)为基体,制备了改性沸石填充的PDMS渗透汽化杂化膜。用X射线衍射(XRD)、扫描电子显微镜(SEM)、傅立叶变换红外光谱(FT-IR)、热重分析(TGA)、机械拉伸等手段对改性的效果和杂化膜的热稳定性能进行了表征,结果表明改性后沸石晶型未改变,杂化膜热稳定性和机械性能提高。并以乙醇质量分数为5%的乙醇/水体系为研究对象,分离因子为评价指标,考察了改性杂化膜对乙醇的分离性能,结果表明膜对乙醇/水的分离因子可由未改性时的16提高至29.5,这说明采用硅烷偶联剂对沸石进行改性是提高膜分离性能的有效方法。
Silicone zeolites were modified with silane coupling agent and vinyltrimethoxysilane (VTMS) as modifier to control the modification time (4 h and 12 h). Polydimethylsiloxane (PDMS) Matrix, a modified zeolite filled PDMS pervaporation hybrid membrane was prepared. The effect of the modification and the thermal stability of the hybrid films by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA) The results showed that the modified zeolite crystal form did not change, the thermal stability of the hybrid film and mechanical properties increased. The ethanol / water system with ethanol content of 5% was used as the research object. The separation factor was used as the evaluation index to study the separation performance of the modified hybrid membrane on ethanol. The results showed that the membrane / ethanol / water separation factor could be modified by unmodified When 16 increased to 29.5, indicating that the use of silane coupling agent modified zeolite is an effective way to improve membrane separation performance.