Study of cryostructuring of polymer systems: 31. Effect of additives of alkali metal chlorides on physicochemical properties and morphology of poly(vinyl alcohol) cryogels

Lozinsky, V. I.; Сахно, Н. Г.; Damshkaln, Lilija G.; Bakeeva, I. V.; Zubov, V.P.; Kurochkin, Ilya N.; Kurochkin, Ilya I.

doi:10.1134/s1061933x11020086

Cited by 25 publications

(30 citation statements)

References 30 publications

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“…In addition to the physicomechanical properties and heat endurance of composite PVACGs filled with microdroplets of С 10 -С 14 alkanes, we studied the peculiarities of such gels microstructure using optical microscopy and the technique of thin sections, which has proved to be an efficient method for studying the morphology of various PVA cryogels [20,25,27,32,35,53]. In our case, comparison between the images of PVACGs filled with decane, dodecane, or tetradecane microdroplets has not demonstrated marked general differences.…”

Section: Morphological Peculiarities Of Composite Pvacgs Containing Dmentioning

confidence: 70%

“…In [20,35], it was shown that ordinary and filled cryogels that are rather convenient for further mea surements are obtained by freezing at -20°C followed by defrosting at a rate of 0.03°C/min of samples pre pared from 80 g/l solutions of PVA with a molecular mass of 86 kDa and the degree of deacylation of 100%. These regimes of cryostructuring were used in this work to prepare composite PVACGs filled with micro The plots in Fig.…”

Section: Physicomechanical Properties Of Composite Pvacgs Containing mentioning

confidence: 99%

“…For example, it was found that the influ ence of low molecular mass electrolytes is mainly related to the lyotropic properties of the latter [16][17][18][19][20], while, in the presence of polymer additives, phase separation processes take place due to the thermody namic incompatibility of macromolecules with differ ent chemical structures in a common solvent [6,7,21,22]. When any dispersed fillers (solid particles [23][24][25][26], viscoelastic gels [25,27,28], microorganism cells [8,23,29,30], gas bubbles [31][32][33], microdroplets of liquids immiscible with PVA solutions [34,35], or nanoparticles [36][37][38][39]) are incorporated into an initial PVA solution, subsequent cryogenic treatment of such suspensions, foams, or emulsions results in the forma tion of composite cryogels, the physical characteristics and structures of which are governed by a large number of factors.…”

Section: Introductionmentioning

confidence: 99%

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Study of cryostructuring of polymer systems. 32. Morphology and physicochemical properties of composite poly(vinyl alcohol) cryogels filled with hydrophobic liquid microdroplets

2012

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Cryogenic treatment (freezing at -20°C for 12 h followed by defrosting at a rate of 0.03°C/min) of decane, dodecane, or tetradecane emulsions in a poly(vinyl alcohol) solution (80 g/l) is employed to pre pare composite cryogels containing microdroplets of liquid hydrophobic fillers entrapped into a macroporous hydrogel matrix. The effects of the type of a hydrocarbon, the degree of filling, and the addition of a surfactant (decaethylene glycol cetyl ether) on the physicomechanical properties, heat endurance, and morphology of the composites are studied. It is shown that, an increase in the content of liquid hydrophobic fillers within some range of their volume fraction enhances the rigidity of corresponding cryogels. Incorporation of the nonionic surfactant into the initial emulsions results in a complex dependence of the rigidity of the resulting composite cryogels on surfactant concentration and variations in the morphology of pores in the gel phase. At the same time, the heat endurance of all examined composite cryogels weakly depends on the type and concentration of the hydrocarbon fillers, as well as the presence of surfactant additives.

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Section: Morphological Peculiarities Of Composite Pvacgs Containing Dmentioning

confidence: 70%

Section: Physicomechanical Properties Of Composite Pvacgs Containing mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of cryostructuring of polymer systems. 32. Morphology and physicochemical properties of composite poly(vinyl alcohol) cryogels filled with hydrophobic liquid microdroplets

2012

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“…The images were equated and processed as we described in detail elsewhere [24,25,29]. Based on the data of image processing, two parameters characterizing sample morphology were calculated, i.e., effective porosity P and average effec tive cross sectional size Q of macropores in a sample.…”

Section: Methodsmentioning

confidence: 99%

Study of cryostructuring of polymer systems. 33. Effect of rate of chilling aqueous poly(vinyl alcohol) solutions during their freezing on physicochemical properties and porous structure of resulting cryogels

et al. 2012

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Poly(vinyl alcohol) cryogels are obtained and investigated. The cryogels are prepared by freezing an initial polymer solution (100 g/L) at chilling rates of 1.85, 0.3, 0.03, or 0.003°C/min followed by defrosting the frozen (-20°C/12 h) preparations at heating rates of 0.3, 0.03, or 0.003°C/min. It is shown that a notice able influence of the chilling rate on the rigidity and heat endurance of the gel matrix is observed at very slow regimes of chilling (on the order of thousandths of degree centigrade per minute). One of the reasons for a reduction in the rigidity of resulting cryogels and the fusion enthalpy of the nodes in their supramolecular net works is the formation of a homo phase hydrogel during the long term exposure of the concentrated polymer solution to low temperatures prior to the onset of ice crystallization. The effect of the regime of chilling the polymer solution being frozen on the porous structure of cryogels resulting from the thawing of the prepara tions is ambiguous due to the multifactor character of this effect; therefore, in many cases, well defined struc ture-property correlations are not observed.

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“…PVA formed in mixed solvents [1,20,23,234,264,373], complex PVA cryogels [1,234,239,374], and composite PVA cryogels [1,20,23,29,234,236,237,252,254,265,[375][376][377].…”

Section: Multiplementioning

confidence: 99%

A Brief History of Polymeric Cryogels

Lozinsky

2014

Advances in Polymer Science

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Study of cryostructuring of polymer systems: 31. Effect of additives of alkali metal chlorides on physicochemical properties and morphology of poly(vinyl alcohol) cryogels

Cited by 25 publications

References 30 publications

Study of cryostructuring of polymer systems. 32. Morphology and physicochemical properties of composite poly(vinyl alcohol) cryogels filled with hydrophobic liquid microdroplets

Study of cryostructuring of polymer systems. 32. Morphology and physicochemical properties of composite poly(vinyl alcohol) cryogels filled with hydrophobic liquid microdroplets

Study of cryostructuring of polymer systems. 33. Effect of rate of chilling aqueous poly(vinyl alcohol) solutions during their freezing on physicochemical properties and porous structure of resulting cryogels

A Brief History of Polymeric Cryogels

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