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Article Dans Une Revue Polymer Année : 2022

Controlled grafting of multi-block copolymers for improving membrane properties for CO2 separation

Marc Ponçot
Isabelle Royaud

Résumé

Linear poly(ether-urea-imide)s (PUIs) are attractive multi-block segmented copolymers well-known for high selectivity for CO2 separations. Their CO2 permeability generally increases but their selectivity decreases with their polyether soft content limited to 70 wt% to preserve their mechanical properties. In this work, the grafting of a PUI copolymer with PEO-based soft grafts is reported for strongly increasing the membrane properties. The design of the grafted copolymers involved step-growth polymerization, controlled radical polymerization, and "click" chemistry. This strategy ensured the control of grafting rate, graft molecular weight and soft contents varying from 57 to 85 wt%. The membrane properties for CO2 and N2 permeation were correlated to the PUI chemical structure, morphology and soft content. The best membrane properties (PCO2 = 196 Barrer; alphaCO2/N2 = 39 at 2 bar and 35°C) were obtained for PUI-g-1PEDEGA5000 corresponding to the highest grafting rate and graft length. Compared to the non-grafted PUI, the best grafted copolymer had much higher CO2 permeability (×17) while the ideal separation factor alphaCO2/N2 was maintained at high level, thus leading to separation properties very close to the Robeson 2008 upper-bound. By allowing very high contents of amorphous soft phase and specific morphology, the new grafting strategy offered high-performance membranes for CO2 capture.
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Dates et versions

hal-03773682 , version 1 (09-09-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

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Xavier Solimando, Jérôme Babin, Carole Arnal-Herault, Denis Roizard, Danielle Barth, et al.. Controlled grafting of multi-block copolymers for improving membrane properties for CO2 separation. Polymer, 2022, 255, pp.125164. ⟨10.1016/j.polymer.2022.125164⟩. ⟨hal-03773682⟩
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