疏水性纳米SiO_2填充PDMS/PET复合膜的制备及分离性能研究  

Preparation of hydrophobic nano-silica modified PDMS/PET composite membrane and its pervaporation for dilute ethanol-water solution

作　　者：王光芳[1] 李然[1] 王亮[1] 孙德[1] 

机构地区：[1]长春工业大学化学工程学院,长春130012

出　　处：《膜科学与技术》2011年第6期41-45,共5页Membrane Science and Technology

基　　金：吉林省教育厅自然科学基金([2008]105)

摘　　要：采用聚酯(PET)为支撑层,以疏水性气相法纳米SiO2填充改性的聚二甲基硅氧烷(PDMS)为皮层制备硅橡胶复合膜,用SEM、WSM-5KN、TGA对膜改性后的物理形貌、拉伸强度及热稳定性进行分析与表征,并以乙醇/水物系为研究对象,着重考察了料液温度和浓度对改性复合膜渗透分离性能的影响.结果表明,改性膜的热稳定性显著提高,拉伸强度从空白膜的1.5 MPa增加到7.4 MPa.随着疏水气相法纳米SiO2含量的增加填充膜的分离因子极值不断增加并提前.The PDMS/PET composite membranes were prepared by casting the polydimethylsiloxane （PDMS） membrane filled with fumed hydrophobic nano-silica on PET membrane. The physical morpholo- gy, tensile strength and thermal resistant performance of the as-prepared composite membranes were in- vestigated by SEM, WSM-5KN and TGA. The effects of feed temperature, feed concentration on the per- vaporation performance of ethanol/water solutions were also examined. It is shown from the results that the thermal resistant performance of the modified membrane is significantly improved and its tensile- strength is increased from 1.5 MPa to 7. 4 MPa compared with pure PDMS. Otherwise the peak value of the membrane separation factor seemed to constantly appear in advance.

关 键 词：聚二甲基硅氧烷 SIO2 改性膜 分离因子 

分 类 号：TQ028.8[化学工程]