【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.更多还原

【Abstract】 The PDMS/PET composite membranes were prepared by casting the polydimethylsiloxane(PDMS) membrane filled with fumed hydrophobic nano-silica on PET membrane.The physical morphology,tensile strength and thermal resistant performance of the as-prepared composite membranes were investigated by SEM,WSM-5KN and TGA.The effects of feed temperature,feed concentration on the pervaporation 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.更多还原