Preparation and characterization of PDMS membrane by non-toxic solvent method for gas separation

• Main Authors: Chao-Fong Wu, 吳肇峰
• Other Authors: Ming-Yen Wey
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/99077357895639024195

碩士 === 國立中興大學 === 環境工程學系所 === 102 === In recently, many researchers hope to find the green and clean chemistry processes to reduce environmental problem. This study focus on polydimethylsiloxane (PDMS) membrane which was fabricated through the non-toxic solvent method. Comparing with three solvents (n-Hexane, Deionized water and containing 3.0wt% 4-Dodecylbenzenesulfonic acid (DBSA)), the effect of crosslinking process was discussed by the viscosity property of casting solution. To study the correlation between the different preparation parameters and the structure and permeation properties of PDMS membrane. Therefore, we would use scanning electron microscope (FE-SEM), atomic force microscopy (AFM), viscosity analyzer and Fourier transform infrared spectroscopy (FTIR) in this study, to identify the morphology and cross-linking properties of PDMS membrane. The dense PDMS membrane was prepared successfully by 3.0 wt. % DBSA solvent. The results showed that the amounts of TEOS and crosslinking temperature would affect the rate of crosslinking reaction. Moreover, the viscosity of casting solution was also the important factor. When the viscosity of casting solution was low, the thin PDMS layer was permeated on the substrate surface, which had higher H2/CO2 selectivity. In contrast, the dense PDMS membrane was formed on substrate when the more viscous casting solution, which have the higher the permeability of CO2. On the other hand, the curing process of high temperature can enhance the stability of the membrane structure, and improve resistance-plasticizing in high pressure permeation.