IR spectroscopic and thermogravimetric study of state of water in MGA-95 cellulose acetate membrane

Лазарев, С. И.; Golovin, Yu. M.; Lazarev, D. S.; Поликарпов, В. М.

doi:10.1134/s0965544115100126

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…Obviously, the layer structure is composed of water dipoles oriented perpendicularly to the axis of the polymer molecules, the negative pole of which is disposed in the outer side. As for the projection at 3450 cm -1 , its presence is likely to be connected with the interaction of water molecules of the first hydrated layer with associative water molecules of the next, the so-called destructive layer [5,8]. Consequently, in the swollen sample of membrane the amorphous phase has a definite level of structural organization.…”

Section: Amandtmentioning

confidence: 99%

“…Thus, it should be noted that the water in these spaces is located in different associates: crystalline hydrate (frozen) absorbed (destructurized), in which the water molecules undergo approximately equal in magnitude but different in direction orienting influence of the neighboring water molecules and molecules of hydration shell. Destructurized water layer borders the diffuse layer in which the water retains normal properties [8] and shows the oscillations of OH groups with frequency 3645 cm -1 . Such ordering of associates of water on the surfaces of cellulose acetate molecules corresponds to the structure of the electric double layer, the zeta-potential of which is reduced in magnitude during the swelling of the MGA -95 membrane sample from 53 to 20 mV [10].…”

Section: Amandtmentioning

confidence: 99%

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A Study of Some Physical Problems of Water Condition and Mass Transfer in Cellulose Acetate and Dynamic Membranes

Lavrenchenko¹,

Lazarev²,

Хорохорина³

et al. 2016

AM&T

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The paper presents experimental study of physical water condition and mass transfer in cellulose acetate and dynamic semipermeable membranes by infrared spectrometric and hydrodynamic methods. The authors found that OH-groups of cellulose acetate form a nonequilibrium grid of hydrogen bonds between molecules and their fragments in the amorphous phase of the semipermeable membrane in the air-dried sample. The water molecules adsorbed on active -OH and -C = O groups, particularly in the amorphous phase, create additional negative charge on the molecules of cellulose acetate resulting from the orientation of the water dipoles, which leads to electrostatic repulsion of broken, stranded molecule fragments and straightening of polymer molecule while breaking intermolecular hydrogen bonds. Thermogravimetric studies to find out the structural organization of hydrogen bonds and water condition in the samples of the semipermeable polymeric MGA-95 membrane showed that at temperatures in the air-dry and water-saturated samples the membrane degradation process starts and ends with mass loss and endothermic effect.The research proves the fact of dynamic membranes formation on the ultrafilters from water starch solutions. Due to the changes in condition and volume of water in the dynamic layer of the membrane, it is possible to change kinetic coefficients, i.e. to regulate the process of baromembrane separation of industrial water solutions. Electro-kinetic characteristics of reverse osmosis semipermeable membranes were studied. The experimental curves of the potential depending on sorption of sodium bicarbonate by MGA-95 and LSA-100 membranes were obtained. The discrepancy between the calculated and experimental data did not exceed 10 %. The method devised for determining the membrane potential in the process of sorption of sodium bicarbonate can be used as a testing methodology of polymeric semipermeable membranes.

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Section: Amandtmentioning

confidence: 99%

Section: Amandtmentioning

confidence: 99%

A Study of Some Physical Problems of Water Condition and Mass Transfer in Cellulose Acetate and Dynamic Membranes

Lavrenchenko¹,

Lazarev²,

Хорохорина³

et al. 2016

AM&T

View full text Add to dashboard Cite

show abstract

“…Lazarev et al presented the results of studying the state of water in the composite acetate cellulose membrane MGA-95; water plays the role of a plasticizer and structures the macromolecules of the amorphous phase of the acetate cellulose membrane and transfers it to the liquid crystalline phase, forming additional capillary spaces [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Features of Thermomechanical Stability of Anionic–Cation Exchange Matrix “Polikon AC” on Viscose Non-Woven Materials

et al. 2021

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The thermomechanical stability of the anion–cation exchange matrix “Polikon AC” on viscose nonwoven materials is investigated. In this work, a molecular model of a solvation environment for experimentally obtained “Polikon AC” mosaic membranes is refined. Mosaic membranes on a viscose fiber base were fabricated by the method of polycondensation filling. The temperature dependence of deformation was investigated for dry and wet anion and cation exchange membrane components at a constant tensile load of 1.5 N and a heating rate of 8 °C/min. The effect of moisture content on the deformation of anionite and cationite fragments under a constant external tensile load of 1.5 and 3 N in a temperature range up to 100 °C was studied.

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IR spectroscopic and thermogravimetric study of state of water in MGA-95 cellulose acetate membrane

Cited by 2 publications

References 2 publications

A Study of Some Physical Problems of Water Condition and Mass Transfer in Cellulose Acetate and Dynamic Membranes

A Study of Some Physical Problems of Water Condition and Mass Transfer in Cellulose Acetate and Dynamic Membranes

Features of Thermomechanical Stability of Anionic–Cation Exchange Matrix “Polikon AC” on Viscose Non-Woven Materials

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