Specific Structure and Properties of Composite Membranes Based on the Torlon® (Polyamide-imide)/Layered Perovskite Oxide

Pulyalina, Alexandra; Rostovtseva, Valeriia; Minich, Iana A.; Silyukov, Oleg I.; Toikka, Maria; Сапрыкина, Н. Н.; Polotskaya, G. A.

doi:10.3390/sym12071142

Cited by 9 publications

(4 citation statements)

References 41 publications

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“…Membranes based on aromatic poly(amide-imides) are being actively developed and researched [ 22 , 23 , 24 , 25 , 26 ]. In this work, we study membranes based on poly[(4,4′-bisamide)-oxydiphenylene-N-( p -phenylene)-4-phthalimide] (PAI), i.e., poly(amide-imide) ( Figure 1 ), which has been established as a membrane material in gas separation [ 27 , 28 ] and pervaporation [ 29 ] processes.…”

Section: Introductionmentioning

confidence: 99%

Application of Cyclized Polyacrylonitrile for Ultrafiltration Membrane Fouling Mitigation

et al. 2022

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In this study, novel composites were produced by blending partially cyclized polyacrylonitrile (cPAN) and poly(amide-imide) (PAI) in N-methylpyrrolidone in order to fabricate asymmetric membranes via phase inversion method. The compatibility of PAI and cPAN through possible intermolecular interaction was examined by quantum chemical calculations. The composite membranes were characterized by FTIR, SEM, contact angle measurements, etc. A considerable reduction in the contact angles of water and ethylene glycol (EG) was observed after adding cPAN to the PAI membrane, which is evidence of improved membrane hydrophilicity. Membrane transport properties were investigated in ultrafiltration tests by measuring the pure water flux, rejection of proteins, and flux recovery ratio (FRR). The best properties were found for the membrane containing 5 wt% cPAN; an increase in BSA rejection and a remarkable increase in FRR were observed, which can be explained by the hydrophilization of the membrane surface provided by the presence of cPAN.

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Section: Introductionmentioning

confidence: 99%

Application of Cyclized Polyacrylonitrile for Ultrafiltration Membrane Fouling Mitigation

et al. 2022

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“…In this regard, many research groups all over the world are actively working on the development of new materials and high-performance membranes [ 3 ], applying of commercial membranes available on the market [ 4 ], and conducting pilot tests of tailor-made high-performance composite membranes [ 5 , 6 , 7 , 8 ] for CO 2 capture from different gas streams with specific focus on flue gas treatment. It should be noted that the membrane performance parameters used for gas and liquid separation can be tuned by introduction of different kinds of additives [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Mitigating of Thin-Film Composite PTMSP Membrane Aging by Introduction of Porous Rigid and Soft Branched Polymeric Additives

et al. 2022

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This work was focused on the mitigation of physical aging in thin-film composite (TFC) membranes (selective layer ~1 μm) based on polymer intrinsic microporosity (PTMSP) by the introduction of both soft, branched polyethyleneimine (PEI), and rigid, porous aromatic framework PAF-11, polymer additives. Self-standing mixed-matrix membranes of thicknesses in the range of 20–30 μm were also prepared with the same polymer and fillers. Based on 450 days of monitoring, it was observed that the neat PTMSP composite membrane underwent a severe decline of its gas transport properties, and the resultant CO2 permeance was 14% (5.2 m3 (STP)/(m2·h·bar)) from the initial value measured for the freshly cast sample (75 m3 (STP)/(m2·h·bar)). The introduction of branched polyethyleneimine followed by its cross-linking allowed to us to improve the TFC performance maintaining CO2 permeance at the level of 30% comparing with day zero. However, the best results were achieved by the combination of porous, rigid and soft, branched polymeric additives that enabled us to preserve the transport characteristics of TFC membrane as 43% (47 m3 (STP)/(m2·h·bar) after 450 days) from its initial values (110 m3 (STP)/(m2·h·bar)). Experimental data were fitted using the Kohlrausch–Williams–Watts function, and the limiting (equilibrium) values of the CO2 and N2 permeances of the TFC membranes were estimated. The limit value of CO2 permeance for neat PTMSP TFC membrane was found to be 5.2 m3 (STP)/(m2·h·bar), while the value of 34 m3(STP)/(m2·h·bar) or 12,600 GPU was achieved for TFC membrane containing 4 wt% cross-linked PEI, and 30 wt% PAF-11. Based on the N2 adsorption isotherms data, it was calculated that the reduction of the free volume was 1.5–3 times higher in neat PTMSP compared to the modified one. Bearing in mind the pronounced mitigation of physical aging by the introduction of both types of fillers, the developed high-performance membranes have great potential as support for the coating of an ultrathin, selective layer for gas separation.

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“…Oxide nanosheets (about 1 nm thick) with the perovskite structure have completely different physical properties than their bulk counterparts. They can serve as multipurpose precursors for creating multilayer films, porous composites, and layered nanocomposites [33,[35][36][37][38]. The resulting nanolayers already show intriguing properties with potential uses in photoluminescence [39,40], catalysis [16,[41][42][43], and energy storage [44,45].…”

Section: Introductionmentioning

confidence: 99%

Physical–Chemical Exfoliation of n-Alkylamine Derivatives of Layered Perovskite-like Oxide H2K0.5Bi2.5Ti4O13 into Nanosheets

et al. 2021

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In the present work, we report the results on exfoliation and coating formation of inorganic–organic hybrids based on the layered perovskite-like bismuth titanate H2K0.5Bi2.5Ti4O13·H2O that could be prepared by a simple ion exchange reaction from a Ruddlesden–Popper phase K2.5Bi2.5Ti4O13. The inorganic–organic hybrids were synthesized by intercalation reactions. Exfoliation into nanosheets was performed for the starting hydrated protonated titanate and for the derivatives intercalated by n-alkylamines to study the influence of preliminary intercalation on exfoliation efficiency. The selected precursors were exfoliated in aqueous solutions of tetrabutylammonium hydroxide using facile stirring and ultrasonication. The suspensions of nanosheets obtained were characterized using UV–vis spectrophotometry, dynamic light scattering, inductively coupled plasma spectroscopy, and gravimetry. Nanosheets were coated on preliminarily polyethyleneimine-covered Si substrates using a self-assembly procedure and studied using atomic force and scanning electron microscopy.

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Specific Structure and Properties of Composite Membranes Based on the Torlon® (Polyamide-imide)/Layered Perovskite Oxide

Cited by 9 publications

References 41 publications

Application of Cyclized Polyacrylonitrile for Ultrafiltration Membrane Fouling Mitigation

Application of Cyclized Polyacrylonitrile for Ultrafiltration Membrane Fouling Mitigation

Mitigating of Thin-Film Composite PTMSP Membrane Aging by Introduction of Porous Rigid and Soft Branched Polymeric Additives

Physical–Chemical Exfoliation of n-Alkylamine Derivatives of Layered Perovskite-like Oxide H2K0.5Bi2.5Ti4O13 into Nanosheets

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