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- W3209617212 abstract "In the search for more efficient gas separation membranes, blends offer a compromise between costly high-performance polymers and low-cost commercial polymers. Here, blends of the polymer of intrinsic microporosity, AO-PIM-1, and commercial Matrimid®5218 polyimide are used to prepare dense films by solution casting. The morphology of the pure polymers and their blends with 20, 40, 60 and 80 wt.% of AO-PIM-1 in Matrimid® are studied by scanning electron microscopy, and their pure gas permeability is studied as a function of the blend composition with H2, He, O2, N2, CH4 and CO2. The polymers were found only partially miscible and a two-phase structure was formed with large domains of each polymer. When necessary, the films were coated with a thin silicone layer to heal possible pinhole defects. Even small amounts of Matrimid® in AO-PIM-1 resulted in an unexpectedly strong decrease in the permeability of the PIM, whereas a small amount of the PIM led to a modest increase in permeability of Matrimid®. Due to the two-phase structure, the Maxwell model was more suitable to describe the gas permeability as a function of the blend composition than the model for miscible blends. At low Matrimid® concentrations in AO-PIM-1, all models fail to describe the experimental data due to an unexpectedly strong depression of the permeability of the PIM by Matrimid®. Time lag measurements reveal that the changes in permeability as a function of the blend composition are mostly due to changes in the diffusion coefficient." @default.
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- W3209617212 date "2021-11-04" @default.
- W3209617212 modified "2023-09-24" @default.
- W3209617212 title "Matrimid®5218/AO-PIM-1 Blend Membranes for Gas Separation" @default.
- W3209617212 doi "https://doi.org/10.22079/jmsr.2021.540493.1504" @default.
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