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.
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机译：聚环氧乙烷-聚环氧丙烷-聚环氧乙烷（Pluronic L92，（EO）8（PO）47（EO）8），单乙醇胺（MEA）和水的液晶相的CO2吸收已研究了由60％L92 / 10％MEA / 30％水组成的水，以评估在碳捕获和储存应用中的潜在用途。记录液晶系统中含有CO2的气液平衡数据，直至CO2分压为6 bar，此时样品的载量为38.6 g CO2 / kg。此外，通过小角度X射线散射（SAXS）研究了在加载过程中发生的相变，呈现出从层状+六方相到六方相的转变（在25°C时）。此外，还研究了具有不同载荷的样品的流变性，结果表明，随着CO2载荷的增加，粘度会增加，直到完成向六方相的相变为止。最后，进行了热稳定性实验，结果表明L92不会导致MEA降解。
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