Structural and transport properties of polydimethylsiloxane based polyurethane/silica particles mixed matrix membranes for gas separation

Polyurethane-Based Blend Membrane Containing Polycarbonate for Gas Separation: Compatibility Analysis, Microstructure Evaluation, and CO2 Separation Performance

“…The XRD patterns of the blend membranes reveal the crystalline peaks at 2θ of 17.4°, 19.6°, and 24.5°. In a specific instance, the spectral overlap between amorphous PC and crystalline PU in the M20 membrane resulted in a reduction in the intensity of the crystalline peaks located at 2θ of 19.6°and 24.5°, while the peak at 17 remained unaffected. This finding suggests that the spectral interference caused by the coexistence of amorphous and crystalline domains in polymer membranes should be taken into account when their crystalline characteristics are analyzed using the XRD technique.…”

“…For example, the CO 2 /N 2 selectivity of a PAI/PU blend membrane containing 15 wt % PAI was 20.3, which is higher than the neat PU membrane with a selectivity of 7.7. 17 Similarly, the CO 2 /N 2 and CO 2 /CH 4 selectivity of PU/PVAc blend membranes containing 15 wt % PVAc were up to 417 and 220% higher, respectively, than those of the neat PU membrane. 18 However, the phase separation of hard and soft segments and the fractional free volume of the blend membranes can affect gas permeability and selectivity.…”

PEG/PPG-PDMS-Adamantane-Based Crosslinked Terpolymer Using the ROMP Technique to Prepare a Highly Permeable and CO2-Selective Polymer Membrane

“…To compare the gas separation performance of the developed polymer membranes, the data points were plotted on a Robeson plot, and the data are compared with that for typical rubbery polymer-based membranes [11,13,21,26,30,31,[41][42][43][44][45] (Figure 9). We found that our x(PEG/PPG:PDMS:Ad) membranes had both higher permeability and CO 2 /N 2 selectivity than most PEG-based membranes, and a hybrid crosslinking membrane of PEG and silane, surpassing the 2008 Robeson upper bound for CO 2 /N 2 (Figure 9a).…”

P25/PVC-g-POEM Mixed Matrix Membranes with Simultaneously Improved Permeability and Selectivity for CO₂/N₂ Separation

“…11 Introduction of inorganic filler into the polymer matrix, which results in a mixed matrix membrane (MMM), represents a breakthrough in gas separation research. [12][13][14][15][16][17][18][19][20] TiO 2 nanoparticles (P25) have been incorporated into glassy polymers such as polyimide or poly(1-trimethylsilyl-1-propyne) to form MMMs. [21][22][23] However, the interfacial contact between glassy polymers and rigid inorganic nanoparticles is poor, resulting in the formation of interfacial voids that allow for easy passage of gas molecules, leading to loss of selectivity.…”