Gas permeability of high-temperature-resistant silicone polymer-vycor glass membrane |
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| Institution: | 1. Institute of Process and Particle Engineering, Graz University of Technology, NAWI Graz, Inffeldgasse 13, 8010 Graz, Austria;2. Research Center Pharmaceutical Engineering GmbH, Graz, Austria;3. Institute of Solid State Physics, Graz University of Technology, Graz, Austria;4. Graz Centre for Electron Microscopy, Graz University of Technology, Graz, Austria |
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| Abstract: | A high-temperature-resistant heterogeneous poly (dimethyl siloxane) membrane was prepared in situ by using monomer gas-phase polymerization in microporous media without employing prepolymerization. The permeation rates for various gases were measured at penetrant pressure up to 233 cmHg and at temperatures between 20°C and 200°C. The permeation rates for low-soluble gases, such as He, H2, N2, CO, O2, and Ar, increased with increasing temperature. On the other hand, the permeation rates for highly soluble gases, such as C2H4 and CO2, decreased with increasing temperature. For all gases, the permeation rate increases or decreases linearly with the increase of temperature. The turning points were observed for all gases in the temperature range of 140-160°C. Permeation rates of most gases decreased with the increase of temperature above the turning point, excepting those of helium and hydrogen. |
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