Diffusion and phase separation at the morphology formation of cellulose membranes by regeneration from N-methylmorpholine N-oxide solutions

Ilyin, Sergey O.; Makarova, V. V.; Anokhina, Tatyana S.; Ignatenko, V. Ya.; Brantseva, T. V.; Волков, А. В.; Антонов, С. В.

doi:10.1007/s10570-018-1756-9

Cited by 42 publications

(29 citation statements)

References 51 publications

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“…A detailed description of the technique has been given earlier. [52][53][54] Micrographs of diffusion zones were obtained using an objective with 3.5× magnification and a digital camera with a 12MP 1/1.7 00 -type Sony IMX226 CMOS image sensor (Tokyo, Japan). A diode laser KLM-A532-15-5 (FTI-Optronic, Saint Petersburg, Russia) with a wavelength of 532 nm was used as the light source.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, interference bands bend along the diffusion zone, which makes it possible (by counting the bands crossing the axis of mass transfer during the transition from one medium to another) to determine the profile of the change in refractive index along the diffusion zone and, accordingly, to find the concentrations of diffusing compounds at any point of interest. A detailed description of the technique has been given earlier 52–54 . Micrographs of diffusion zones were obtained using an objective with 3.5× magnification and a digital camera with a 12MP 1/1.7″‐type Sony IMX226 CMOS image sensor (Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

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Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Ilyin

Yadykova

Makarova

et al. 2020

Polymer International

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Sulfonated poly(1,3,4-oxadiazole-2,5-diyl-1,4-phenyleneoxy-1,4-phenylene), poly(1,3,4-oxadiazole-2,5-diyl-10,10-dioxophenoxathiine-2,8-diyl) and their copolymers were one-pot synthesized in fuming sulfuric acid with the use of 4,4 0-oxydibenzoic acid and hydrazine sulfate as initial reagents. These copolymers were non-fusible and did not dissolve in individual liquids except sulfuric acid. However, it was possible to achieve their unlimited solubility using a mixed solvent that contained dimethyl sulfoxide, formamide and water. In dilute and semi-dilute solutions, the copolymers behaved like polyelectrolytes, while in concentrated solutions they formed gels; moreover, in the case of high polymer content, the gels were in a liquid crystalline state. The degree of sulfonation, temperature and water content in the mixed solvent influenced the state of copolymer solutions, their viscosity and viscoelasticity. The finding of the mixed solvent made it possible to form polymer films whose strength and heat resistance reached 33 MPa and 470°C, respectively. The ionic conductivity of the films under direct current conditions was 0.001-0.01 ∼S cm-1 for sodium cations and 0.3-1 mS cm-1 for protons.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Ilyin

Yadykova

Makarova

et al. 2020

Polymer International

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“…Once cellulose has been dissolved, it is generally reprecipitated, or coagulated, by addition of an ''antisolvent'', which competes with the cellulose for bonding to the solvent and initiates phase separation. This method of regeneration can be used for the NaOH-based aqueous systems (Qi et al 2011), NMMO (Ilyin et al 2018) and ILs/DESs described above (Hedlund et al 2019;Sirviö 2019), but in this review we focus herein on cellulose processed from ILs.…”

Section: Cellulose Particlesmentioning

confidence: 99%

Advances in the use of microgels as emulsion stabilisers and as a strategy for cellulose functionalisation

2020

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Microgel particles have recently emerged as an alternative route to emulsion stabilisation. Classed as soft colloidal particles, their ability to swell to differing degrees in certain solvents and to rearrange once attached to an interface makes them highly suitable for systems requiring long-term stabilization, such as formulations in the food, agricultural, cosmetic and pharmaceutical industries. Microgels made with biocompatible polymers such as proteins and polysaccharides in particular offer an environmental advantage and currently form a very active area of research. Cellulose, being a natural, biodegradable polymer, is an attractive ingredient for gels and microgels. However, its use as a functional material is often somewhat hindered by its insolubility in water and most other organic solvents. Furthermore, the surface activity of cellulose has proven difficult to harness and therefore its ability to act as an emulsion stabiliser has been almost exclusively applied to oil-in-water (O/W) emulsions, with very few reports on its water in oil (W/O) activity. This review aims to summarise some of the recent progress made in the microgel field including their ability to act as emulsion stabilisers, with a focus on cellulose microgels (CMGs). A brief overview of cellulose processing is also given, describing the dissolution and reprecipitation routes used to functionalise cellulose without covalent modification and the potential for cellulose particles and CMGs to act as O/W and W/O emulsion stabilisers. Graphic abstract

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“…The intensive development of nanofiltration leads to the use of various polymeric membrane materials. Currently, membranes are being developed based on various polymers, for example: cellulose and its derivatives [2,3], polyamide and its derivatives [4], cellophane [5], polyimide [6], copolymers of 1-trimethylsilyl-1-propyne with 1-(3,3,3trifluoropropyldimethylsilyl)1-propyne [7], polysulfone [8], polyethersulfone [9], polymer of intrinsic microporosity PIM-1 [10,11], poly [1-(trimethylsilyl)-1-propyne] [11][12][13][14][15], and commercially available membranes [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Novel Mixed Matrix Membranes Based on Polymer of Intrinsic Microporosity PIM-1 Modified with Metal-Organic Frameworks for Removal of Heavy Metal Ions and Food Dyes by Nanofiltration

et al. 2021

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Nowadays, nanofiltration is widely used for water treatment due to its advantages, such as energy-saving, sustainability, high efficiency, and compact equipment. In the present work, novel nanofiltration membranes based on the polymer of intrinsic microporosity PIM-1 modified by metal-organic frameworks (MOFs)—MIL-140A and MIL-125—were developed to increase nanofiltration efficiency for the removal of heavy metal ions and dyes. The structural and physicochemical properties of the developed PIM-1 and PIM-1/MOFs membranes were studied by the spectroscopic technique (FTIR), microscopic methods (SEM and AFM), and contact angle measurement. Transport properties of the developed PIM-1 and PIM-1/MOFs membranes were evaluated in the nanofiltration of the model and real mixtures containing food dyes and heavy metal ions. It was found that the introduction of MOFs (MIL-140A and MIL-125) led to an increase in membrane permeability. It was demonstrated that the membranes could be used to remove and concentrate the food dyes and heavy metal ions from model and real mixtures.

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Diffusion and phase separation at the morphology formation of cellulose membranes by regeneration from N-methylmorpholine N-oxide solutions

Cited by 42 publications

References 51 publications

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Advances in the use of microgels as emulsion stabilisers and as a strategy for cellulose functionalisation

Novel Mixed Matrix Membranes Based on Polymer of Intrinsic Microporosity PIM-1 Modified with Metal-Organic Frameworks for Removal of Heavy Metal Ions and Food Dyes by Nanofiltration

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