Direct measurement of gas solubility and diffusivity in poly(vinylidene fluoride) with a high-pressure microbalance |
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Authors: | Nicolas von Solms Adam Rubin Erling H. Stenby |
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Affiliation: | a Department of Chemical Engineering, Centre for Phase Equilibria and Separation Processes (IVC-SEP), Technical University of Denmark, Building 229 DTH, DK-2800 Lyngby, Denmark b NKT Flexibles I/S, Priorparken 510, DK-2605 Brøndby, Denmark |
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Abstract: | We present solubility and diffusion data for the gases methane and carbon dioxide in the polymer poly(vinylidene fluoride). The polymer was cut from extruded piping intended for use in offshore oil and gas applications. Measurements were carried out using a purpose-built high-pressure microbalance. These properties were determined in the temperature range 80-120 °C and in the pressure range 50-150 bar for methane and 20-40 bar for carbon dioxide. In general, good agreement was obtained for similar measurements reported in the literature. Solubility follows a Henry’s law (linear) dependence with pressure. Diffusion coefficients for each of the gases in the polymer were also measured using the balance. Activation energies for diffusion and heats of solution for the two gases in the polymer were also determined. |
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Keywords: | Gas permeation Poly(vinylidene fluoride) Solubility High-pressure microbalance Diffusion |
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