Cryostructuring of Polymeric Systems. 50.† Cryogels and Cryotropic Gel-Formation: Terms and Definitions
Abstract
:1. Cryogels and Cryostructurates
2. Cryotropic Gel-Formation and Cryostructuring
Unfortunately, terminological imprecision which distorts the essence of the considered problems are often met in the literature concerning the wide-pore cryogels. For instance, the term ‘monoliths’ is acquired popularity in the recent time, although the monolith (from the Greek word μονολίτης (monolithis)—a single stone, whole stone lump) can rather be referred to a block of the well-known homophase poly(acrylamide) gel, which is widely used as a medium for the electrophoretic separation of substances, rather than to the supermacroporous heterophase cryogel. The use of the term ‘monolith’ with respect to a soft spongy material, the liquid from which can simply be pressed out under a small mechanical load, seems quite unsubstantiated. If the pressed-out sample, which has lost its primary shape due to this, is again placed in the original solvent, then the cryogel very rapidly swells absorbing the liquid through the system of interconnected capillaries, and recovers the shape completely. Therefore, its elastic properties in the swollen state are mainly determined not by the rigidity of the polymeric framework, as some authors surprisingly believe, but by the swelling pressure and capillary forces, which have been shown for the non-covalent poly(galactomannan) and chemically cross-linked poly(isobutylene) cryogels.
Funding
Conflicts of Interest
References
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Lozinsky, V.I. Cryostructuring of Polymeric Systems. 50.† Cryogels and Cryotropic Gel-Formation: Terms and Definitions. Gels 2018, 4, 77. https://doi.org/10.3390/gels4030077
Lozinsky VI. Cryostructuring of Polymeric Systems. 50.† Cryogels and Cryotropic Gel-Formation: Terms and Definitions. Gels. 2018; 4(3):77. https://doi.org/10.3390/gels4030077
Chicago/Turabian StyleLozinsky, Vladimir I. 2018. "Cryostructuring of Polymeric Systems. 50.† Cryogels and Cryotropic Gel-Formation: Terms and Definitions" Gels 4, no. 3: 77. https://doi.org/10.3390/gels4030077