Study of cryostructuring of polymer systems. 32. Morphology and physicochemical properties of composite poly(vinyl alcohol) cryogels filled with hydrophobic liquid microdroplets |
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Authors: | E A Podorozhko T V Vorontsova V I Lozinsky |
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Institution: | 1.Nesmeyanov Institute of Organoelement Compounds,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | 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 prepare 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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