| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 101 === Mixed matrix membranes (MMMs) are considered as a potential candidate for membrane separation techniques due to their attractive mechanical strength, thermal stability and superior perm-selectivity properties. In general, the MMMs consist of organic polymer and inorganic particle phases. However, the permselectivity properties of MMMs are greatly influenced by both the dispersing degree of nano-particles in the continuous phase (polymers) and the interfacial adhesion between the inorganic and organic components. Therefore, the problems MMMs faced are challenging to achieve an optimized interface structure and forming composite membrane with an ultrathin and defect-free mixed matrix skin by novel preparation technology.
In this study, the PPO-silica MMMs was synthesized through in-situ sol-gel method, and the effect of silica loading weight and heat treatment on the gas separation performance was investigated. The gas permeation was studied and the morphological, crystalline structure, thermal stability, and functional group of MMMs was obtained using SEM, TGA, XRD, and FTIR, respectively.
The results indicate that using in-situ sol-gel method to synthesize PPO-silica MMMs is beneficial for improving nano-filler dispersion. The permeability towards H2, CO2, O2, N2, and CH4 can be enhanced without increasing selectivity slightly. Further, an improvement in adhesion between both phase and crystal structure of the polymer matrix has been observed by the recrystallization process after heat treatment, which is beneficial for diffusivity of lower molecular weight of gas components. Thus, an enhanced H2 permeability from 51.26 to 117.78 GPU and the H2/CO2 separation ratio ca. 3.6 was observed from 5 wt. % PPO-silica MMMs.
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