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    Blending PPO-based molecules with Pebax MH 1657 in membranes for gas separation

    Year: 2018

    Journal: J. Appl. Polym. Sci., Volume 135, JUL 15

    Authors: Didden, Jeroen; Thur, Raymond; Volodin, Alexander; Vankelecom, Ivo F. J.

    Organizations: Agency for Innovation by Science and Technology (IWT Vlaanderen), through an SBO-STW grant [131720]; Research Foundation-Flanders (FWO) [1S63317N]; KU Leuven through OT [11/061]; IDO grant [13/005]; Belgian Federal government [FS2]

    Keywords: blends; membranes; separation techniques

    This work explores the possibilities to blend block copolymers, i.e., Pebax MH 1657, with a variety of cheap poly(propylene oxide)-rich molecules which could potentially play a double role in the resulting membranes as dispersing/stabilizing agents in multi-component casting solutions and as a gas transport medium in the final membrane. These membranes were prepared by solution casting and were characterized by differential scanning calorimetry, scanning electron microscopy, atomic force microscopy, X-ray diffraction, density measurements, and Fourier transform infrared-attenuated total reflection, while additive incorporation was also studied with theoretical calculations. Gas permeation measurements showed that this approach resulted in increased permeabilities at the expense of mixed-gas selectivity. An interpretation of the blend structure was finally made using gas transport models. The compatibility of these additives with the synthesis of selective gas separation membranes may enable a potential double role in membrane synthesis, i.e., as stabilizing agents in membrane synthesis and as a gas transport medium in the final membrane. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46433.
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