Association of hard segments in gas separation through polyurethane membranes with aromatic bulky chain extenders

Fakhar, Afsaneh; Sadeghi, Morteza; Dinari, Mohammad; Lammertink, Rob G.H.

doi:10.1016/j.memsci.2018.12.062

Cited by 44 publications

(44 citation statements)

References 73 publications

(106 reference statements)

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“…The existence of three-dimensional continuous cavities proved the loose packing structure of the polymers. 41,42 Although the tendency of the FFVs is consistent with the experimental values and molecular dynamics simulation, the differences in the values obtained by the two methods are attributed to the following: (i) the multiple 1.3 molecular chain packing was reasonable in Bondi's group contribution method but not accepted in the actual molecular chain packing of glassy polymers; (ii) the semi-empirical formulas were used to optimise the force eld in the process of simulation, resulting in an inherent error. [43][44][45] 3.5.…”

Section: Fractional Free Volume (Ffv) Of the Pismentioning

confidence: 99%

The spirobichroman-based polyimides with different side groups: from structure–property relationships to chain packing and gas transport performance

et al. 2021

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Section: Fractional Free Volume (Ffv) Of the Pismentioning

confidence: 99%

The spirobichroman-based polyimides with different side groups: from structure–property relationships to chain packing and gas transport performance

et al. 2021

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“…[23] As free volume decreases, gas molecules with larger size are more confined to permeate, which can result in permeability reduction and selectivity increment as expressed by Sadeghi et al [24] Since rubbery membranes mostly conduct gas separation via solubility mechanism, they are preferred for CO 2 capture compared to glassy ones. [25] Polyurethanes (PU)s are good category of rubbery membranes for CO 2 separation. [26,27] Polyurethanes are served in coatings, sealants, textiles, medical, and membrane industries.…”

Section: Introductionmentioning

confidence: 99%

“…Higher phase separation is in favor of gas permeability. [25,29,30] To raise the gas permeation properties of polyurethane membranes, various inorganic nanoparticles were employed in different researches. The influence of nonpermeable nano-silica on PU gas separation was explored.…”

Section: Introductionmentioning

confidence: 99%

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Gas separation through polyurethane–ZnO mixed matrix membranes and mathematical modeling of the interfacial morphology

et al. 2020

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A series of polyurethane/ZnO membranes was fabricated via thermal phase inversion of the solution of polymer/nanoparticle in N,N‐dimethylformamide solvent. The polyurethane synthesis was done via two‐step polymerization method using polytetramethylene glycol, isophorone diisocyanate, and 1,4‐butanediol in the ratio of 1:3:2. Different concentrations of zinc oxide nanoparticles (5, 10, 15, and 20) were incorporated into the polyurethane matrix. FTIR, SEM, and X‐Ray analysis were performed to characterize the membranes. FTIR and SEM results suggests an increment in the phase mixing of polyurethane with ZnO loading. Gas permeation performance through polyurethane‐ZnO mixed matrix membranes with ZnO loading by as much as 20 wt% were elucidated for pure N2, O2, CH4, and CO2 and gases. Based on the results, all permeability values decreased as the loading of ZnO nanoparticles increased, whereas CO2/N2 and CO2/CH4 selectivities increased. Moreover, interfacial structure of the polyurethane/ZnO nanocomposites were characterized by molecular probing approach. The results revealed the presence of a rigidified polymer chain layer with 65 ± 6 Å thickness around the ZnO nanoparticles.

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“…Rubbery polymers with ethereal polar groups are promising materials for CO 2 /N 2 separation. Recent studies reported that polyethylene (PU) glycol‐based polyurethanes are good candidates for use in gas separation membranes . The suppressing crystallization of ethereal groups in polyurethanes can be beneficial for the CO 2 selectivity improvements without a significant loss in the permeability …”

Section: Introductionmentioning

confidence: 99%

Improved gas transport properties of polyurethane–urea membranes through incorporating a cadmium‐based metal organic framework

Sadeghi

Isfahani

Shamsabadi

et al. 2019

J of Applied Polymer Sci

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The increasing need for more efficient separation processes has motivated the development of polymer membranes that can provide fast and selective transport. In this work, cadmium‐based metal–organic framework (MOF) nanoparticles and a polyurethane–urea (PUU) elastomer were synthesized. New mixed‐matrix membranes (MMMs) were then fabricated from the nanoparticles and the PUU. SEM images verified that embedding the nanoparticles changes the morphology of the PUU and the nanoparticles disperse well in the PUU due to satisfactory compatibility of the polymer and nanoparticles. Fourier transform infrared spectroscopy and X‐ray diffraction analysis confirmed the dispersion of the nanoparticles in the soft segment of the PUU. With increased temperature, gas permeabilities of the MMMs improved but their sieving ability deteriorated. An MMM incorporating 2.5 wt % of the MOF showed a CO2 permeability of ~140 barrer and a CO2/N2 selectivity of ~30, which are 89 and 38% higher than those of the pristine membrane. Gas permeation tests showed that the higher CO2/N2 selectivity of the MMMs was due to improved solubility selectivity and the higher CO2 permeability was a result of improved CO2 diffusivity and solubility coefficients. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48704.

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Association of hard segments in gas separation through polyurethane membranes with aromatic bulky chain extenders

Cited by 44 publications

References 73 publications

The spirobichroman-based polyimides with different side groups: from structure–property relationships to chain packing and gas transport performance

The spirobichroman-based polyimides with different side groups: from structure–property relationships to chain packing and gas transport performance

Gas separation through polyurethane–ZnO mixed matrix membranes and mathematical modeling of the interfacial morphology

Improved gas transport properties of polyurethane–urea membranes through incorporating a cadmium‐based metal organic framework

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