SiO_2/PDMS复合膜的制备及其渗透汽化性能研究  

Preparation and pervaporation performance of SiO_2/PDMS composite membranes

作　　者：展侠[1] 马思蕊[1] 刘吉辉[1] 李鸽[1] 夏小凡[1] 

机构地区：[1]北京工商大学北京市食品风味化学重点实验室,北京100048

出　　处：《化工新型材料》2015年第8期125-127,共3页New Chemical Materials

基　　金：国家自然科学基金资助项目(21206001);北京市自然科学基金资助项目(2132010);化学工程联合国家重点实验室开放课题资助(SKLChE-13A02);大学生科学研究与创业行动计划建设项目

摘　　要：以PVDF为支撑层,制备了疏水性二氧化硅(SiO2)填充聚二甲基硅氧烷(SiO2/PDMS)复合膜,通过扫描电镜、接触角测试和热失重分析对复合膜微观形貌、表面疏水性和热性能进行了表征。研究发现,SiO2的加入,可以有效提高PDMS膜的表面疏水性和热稳定性。疏水性SiO2与PDMS基体结合紧密,当SiO2填充低于3%(wt,质量分数,下同)时,纳米粒子在PDMS基体中分散均匀,未发现明显团聚。将复合膜用于渗透汽化乙醇/水体系的分离,发现SiO2的加入,在填充量为1.5%时,SiO2/PDMS复合膜综合分离性能优于纯PDMS膜,尤其是操作温度升高时,与纯PDMS膜相比,复合膜分离因子下降幅度较小,而渗透通量增加较快,表现出较好的综合分离性能。Hydrophobic SiO2 filled PDMS composite membranes were prepared with porous PVDF membrane as support layer. The morphology,surface hydrophobicity and thermal stability of membranes were characterized with SEM, CA and TGA analysis. It was found that the incorporation of SiO2 into PDMS could enhance the surface hydrophobicity and thermal stability of membranes. SiOz and PDMS showed good integration with each other. As SiO2 loading was below 3wt%,nano-SiO2 dispersed in PDMS matrix homogeneously and no apparent aggregation appeared. The membranes were applied for the separation of ethanol/water mixtures via pervaporation. It was found that the composite membrane with 1.5wt% SiO2 loading showed better pervaporation performance than pure PDMS membrane. As operation temperature in- creased,the decreasing range of separation factor of composite membrane was smaller than that of pure PDMS, while per- meation flux increased sharply,which showed pervaporation performance was enhanced.

关 键 词：二氧化硅 聚二甲基硅氧烷 渗透汽化 乙醇/水 

分 类 号：TQ051.893[化学工程]