Enhancing Gas Permeation Properties of Pebax® 1657 Membranes via Polysorbate Nonionic Surfactants Doping

Abstract

Composite membranes were prepared by co-casting, incorporating two nonionic surfactants in a poly(ether-block-amide), Pebax® 1657 up to 50 wt %. These polysorbate nonionic surfactants contain many ethylene oxide units and are very CO2-philic agents; thereby, they can be exploited as membrane additives for gas separation involving carbon oxide. Dynamic light scattering analysis proved a higher stability of additionated Pebax® 1657 solutions with respect to those containing only the copolymer. Scanning electron microscopy showed a regular membrane morphology without pores or defects for all investigated samples. If on the one hand the addition of the additive has depressed the mechanical properties, on the other, it has positively influenced the gas transport properties of Pebax® 1657 films. CO2 permeability increased up to two or three times after the incorporation of 50 wt % additive in copolymer matrix, while the selectivity was not significantly affected. The effect of temperature on permanent gas transport properties was studied in the range of 15–55 °C.

Superior Pebax‐1657/amine‐modified halloysite nanotubes mixed‐matrix membranes to improve the CO2/CH4 separation efficiency

“…However, with extra increasing the NH 2 ‐HNTs loading (2 wt%), CO 2 permeability rises, while the ideal selectivity lessens and the data points get away from the 1991 upper bound. Additionally, for the extra assessment of this work's resultant membranes performance, permeability‐selectivity data of other Pebax‐based membranes in literature, 3,9–12,43,59–61 were put in Figure 7, and the outcomes showed superiority of the prepared MMMs in this study, particularly that loaded with 1.5 wt% of NH 2 ‐HNTs compared to the other MMMs. As a consequence, this membrane can be considered a suitable choice for CO 2 /CH 4 separation.…”

Poly(ether-block-amide) Copolymer Membranes in CO2 Separation Applications

“…The CO 2 separation efficiency of pristine Pebax membranes and the effect of various parameters such as chemical structure, thickness, crystallinity, and thermal stability on the membrane performance have been studied in different reports. − Additionally, many already published studies have aimed at improving the properties of Pebax copolymers for gas separation, specifically in pre- and postcombustion processes. Membranes based on chemically modified or cross-linked polymers and nanocomposite membranes with organic or inorganic dispersed fillers are the outcomes of such studies. − …”

Thin Film Mixed Matrix Hollow Fiber Membrane Fabricated by Incorporation of Amine Functionalized Metal-Organic Framework for CO2/N2 Separation

“…After the formation of Pebax ® 2533 layer on the shell side of PP hollow fiber support, the characteristic peaks of the –CH 3 group from PP disappeared. The characteristic peaks at 1109, 1640, 1734, and 3308 cm −1 , are assigned to the stretching vibration of the C–O–C group of the PEO segment part, the N–H–C=O stretching vibration, the –O–C=O group, and the –N–H– stretching vibration of the polyamide block in Pebax ® 2533, respectively [ 33 , 39 ]. The FTIR spectra of the prepared Pebax ® 2533-UiO-66-NH 2 /PP thin film mixed matrix hollow fiber membranes are similar to the FTIR spectra of pristine Pebax ® 2533/PP hollow fiber membranes, which demonstrates that there were no strong chemical interaction between UiO-66-NH 2 fillers and Pebax ® 2533 matrix.…”