CO2 Selective PolyActive Membrane: Thermal Transitions and Gas Permeance as a Function of Thickness

ACS Applied Materials & Interfaces
Md Mushfequr RahmanVolker Abetz

Abstract

It is generally accepted that the melting point of a semicrystalline polymer is associated with the thickness of the crystalline lamellae (Gibbs-Thomson equation). In this study, a commercially available multiblock copolymer PolyActive composed of 77 wt % of poly(ethylene glycol terephthalate) and 23 wt % of poly(butylene terephthalate) was dip-coated on top of a multilayer microporous support. The thickness was changed between 0.2 and 8 μm using coating solutions containing 0.75-7.5 wt % PolyActive. The surface temperature of the membrane during dip-coating was monitored using an infrared camera. Single gas permeances of N2, H2, CH4, and CO2 were measured between 20 and 80 °C at temperature steps of 2 °C. Spherulitic superstructures composed of radially directed lamellae were observed in the polarized light microscope in the prepared membranes. Atomic force microscopy studies showed that the thickness of the crystalline lamellae was in the order of 10 nm or 0.01 μm at the surface of the membrane. Therefore, according to the Gibbs-Thomson equation, the melting point should not change in the thickness range 0.2-8 μm. However, the gas permeance data showed that the melting point of the polyether domains of the 0.2 μm PolyActive l...Continue Reading

References

Jul 26, 2008·Nature Nanotechnology·Ozgur SahinOlav Solgaard
Jul 24, 2010·Angewandte Chemie·Deanna M D'AlessandroJeffrey R Long
Jun 16, 2016·Nature Communications·O HauensteinA Greiner
Jul 19, 2017·ACS Applied Materials & Interfaces·Peng-Fei CaoTomonori Saito
Jan 1, 1960·Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry·John I Lauritzen, John D Hoffman

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Citations

May 15, 2021·Macromolecular Rapid Communications·Md Mushfequr Rahman, Volker Abetz

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