scholarly journals CO2 in Lyotropic Liquid Crystals: Phase Equilibria Behavior and Rheology

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 309 ◽  
Author(s):  
Sandra Rodríguez-Fabià ◽  
Jens Norrman ◽  
Hanna K. Knuutila ◽  
Johan Sjöblom ◽  
Kristofer Paso
Keyword(s):  
Ethylene Oxide ◽  
Carbon Capture ◽  
Liquid Crystalline ◽  
Hexagonal Phase ◽  
Carbon Capture And Storage ◽  
Lyotropic Liquid Crystals ◽  
Co2 Absorption ◽  
Co2 Partial Pressure ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

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.

scholarly journals CO2 in Lyotropic Liquid Crystals: Monoethanolamine-Facilitated Uptake and Swelling

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 883 ◽  
Author(s):  
Sandra Rodríguez-Fabià ◽  
Jens Norrman ◽  
Johan Sjöblom ◽  
Kristofer Paso
Keyword(s):  
Liquid Crystals ◽  
Ethylene Oxide ◽  
Liquid Crystalline ◽  
Carbon Capture And Storage ◽  
Phase Region ◽  
Lyotropic Liquid Crystals ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Ternary systems consisting of amphiphilic block copolymers/water/monoethanolamine (MEA) have been studied as potential solvents for carbon capture and storage (CCS). The phase behavior of two poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) copolymers with average compositions (EO)8(PO)47(EO)8 (L92) and (EO)3(PO)50(EO)3 (L81) have been investigated by cross-polarized visual observation and small angle X-ray scattering (SAXS). The respective ternary phase diagrams have been studied for systems containing MEA and the equivalent systems containing CO2-loaded MEA. The presence of MEA loaded with CO2 hinders self-association, preventing the formation of liquid crystalline phases. One-phase liquid crystalline regions were found at low MEA concentrations (below 20 wt %) in L92. In the case of L81, only one one-phase region consisting of coexisting lamellar and disordered aggregates was found at 5 wt % MEA. The swelling of the liquid crystalline phases with MEA was investigated along designated dilution lines. The lattice parameters of L92 liquid crystals decrease upon addition of MEA, whereas L81 aggregates show the opposite behavior.

scholarly journals The Influence of Hydrophobic Blocks of PEO-Containing Copolymers on Glyceryl Monooleate Lyotropic Liquid Crystalline Nanoparticles for Drug Delivery

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2607
Author(s):  
Aleksander Forys ◽  
Maria Chountoulesi ◽  
Barbara Mendrek ◽  
Tomasz Konieczny ◽  
Theodore Sentoukas ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Ethylene Oxide ◽  
Liquid Crystalline ◽  
Colloidal Dispersions ◽  
Amphiphilic Block Copolymers ◽  
Poly Lactic Acid ◽  
Glyceryl Monooleate ◽  
Liquid Crystalline Nanoparticles ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The investigation of properties of amphiphilic block copolymers as stabilizers for non-lamellar lyotropic liquid crystalline nanoparticles represents a fundamental issue for the formation, stability and upgraded functionality of these nanosystems. The aim of this work is to use amphiphilic block copolymers, not studied before, as stabilizers of glyceryl monooleate 1-(cis-9-octadecenoyl)-rac-glycerol (GMO) colloidal dispersions. Nanosystems were prepared with the use of poly(ethylene oxide)-b-poly(lactic acid) (PEO-b-PLA) and poly(ethylene oxide)-b-poly(5-methyl-5-ethyloxycarbonyl-1,3-dioxan-2-one) (PEO-b-PMEC) block copolymers. Different GMO:polymer molar ratios lead to formulation of nanoparticles with different size and internal organization, depending on the type of hydrophobic block. Resveratrol was loaded into the nanosystems as a model hydrophobic drug. The physicochemical and morphological characteristics of the prepared nanosystems were investigated by dynamic light scattering (DLS), cryogenic transmission electron microscopy (cryo-TEM), fast Fourier transform (FFT) analysis and X-ray diffraction (XRD). The studies allowed the description of the lyotropic liquid crystalline nanoparticles and evaluation of impact of copolymer composition on these nanosystems. The structures formed in GMO:block copolymer colloidal dispersions were compared with those discussed previously. The investigations broaden the toolbox of polymeric stabilizers for the development of this type of hybrid polymer/lipid nanostructures.

Liquid Crystalline Assembly of a Diblock Rod−Coil Polymer Based on Poly(ethylene oxide) and Its Complexes with LiCF3SO3

1996 ◽  
Vol 29 (17) ◽  
pp. 5567-5573 ◽  
Author(s):  
Myongsoo Lee ◽  
Nam-Keun Oh ◽  
Hwan-Koo Lee ◽  
Wang-Cheol Zin
Keyword(s):  
Ethylene Oxide ◽  
Liquid Crystalline ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
Sign in / Sign up

Export Citation Format

Share Document