PEEK–WC-Based Mixed Matrix Membranes Containing Polyimine Cages for Gas Separation

Molecules

Chiara Milanese¹  Valeria Amendola¹  Sonia La Cognata¹  Riccardo Mobili¹  Alessio Fuoco²  Elisa Esposito²  Marcello Monteleone²  Johannes C. Jansen² 

[1] Dipartimento di Chimica, Università degli Studi di Pavia, Via Taramelli 12, 27100 Pavia, Italy;Institute on Membrane Technology, National Research Council of Italy (CNR-ITM), Via P. Bucci 17/C, 87036 Rende, Italy;

关键词: organic cage;    mixed matrix membrane;    gas separation;    Maxwell model;    gas permeability;    gas diffusion;   

DOI  :  10.3390/molecules26185557

来源: DOAJ

【 摘 要 】

Membrane-based processes are taking a more and more prominent position in the search for sustainable and energy-efficient gas separation applications. It is known that the separation performance of pure polymers may significantly be improved by the dispersion of suitable filler materials in the polymer matrix, to produce so-called mixed matrix membranes. In the present work, four different organic cages were dispersed in the poly(ether ether ketone) with cardo group, PEEK-WC. The m-xylyl imine and furanyl imine-based fillers yielded mechanically robust and selective films after silicone coating. Instead, poor dispersion of p-xylyl imine and diphenyl imine cages did not allow the formation of selective films. The H₂, He, O₂, N₂, CH₄, and CO₂ pure gas permeability of the neat polymer and the MMMs were measured, and the effect of filler was compared with the maximum limits expected for infinitely permeable and impermeable fillers, according to the Maxwell model. Time lag measurements allowed the calculation of the diffusion coefficient and demonstrated that 20 wt % of furanyl imine cage strongly increased the diffusion coefficient of the bulkier gases and decreased the diffusion selectivity, whereas the m-xylyl imine cage slightly increased the diffusion coefficient and improved the size-selectivity. The performance and properties of the membranes were discussed in relation to their composition and morphology.

【 授权许可】

Unknown