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Open AccessArticle

CO2 in Lyotropic Liquid Crystals: Phase Equilibria Behavior and Rheology

Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
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Polymers 2019, 11(2), 309; https://doi.org/10.3390/polym11020309
Received: 9 January 2019 / Revised: 2 February 2019 / Accepted: 9 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Self-assembly of Block Copolymers)
The CO2 absorption of liquid crystalline phases of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (Pluronic L92, (EO)8(PO)47(EO)8), monoethanolamine (MEA), and water, with a composition of 60% L92/10% MEA/30% water has been investigated to assess potential use in carbon capture and storage applications. Vapor–liquid equilibrium data of the liquid crystalline system with CO2 was recorded up to a CO2 partial pressure of 6 bar, where a loading of 38.6 g CO2/kg sample was obtained. Moreover, the phase transitions occurring during the loading process were investigated by small angle X-ray scattering (SAXS), presenting a transition from lamellar + hexagonal phase to hexagonal (at 25 °C). In addition, the rheology of samples with varying loadings was also studied, showing that the viscosity increases with increasing CO2-loading until the phase transition to hexagonal phase is completed. Finally, thermal stability experiments were performed, and revealed that L92 does not contribute to MEA degradation. View Full-Text
Keywords: Lyotropic liquid crystals; CO2 capture; phase behavior; PEO-PPO-PEO; MEA; CO2 absorption; rheology of liquid crystals Lyotropic liquid crystals; CO2 capture; phase behavior; PEO-PPO-PEO; MEA; CO2 absorption; rheology of liquid crystals
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MDPI and ACS Style

Rodríguez-Fabià, S.; Norrman, J.; Knuutila, H.K.; Sjöblom, J.; Paso, K. CO2 in Lyotropic Liquid Crystals: Phase Equilibria Behavior and Rheology. Polymers 2019, 11, 309.

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