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Hydrogels are high water content materials prepared by polymer crosslinking that are able to release active species, such as therapeutic, antibacterial, antiperspirant and moisturising agents, and fragrances. In recent years, several hydrogel systems have been reported based on both natural and synthetic polymers. Among the natural polymers, chitosan and cellulose-derivatives have been extensively...
Hydrogels are three-dimensional, hydrophilic, polymer networks that are able to imbibe large amounts of water or biological fluids, while maintaining their dimensional stability. The polymer binding might be achieved by chemical or physical interactions. Physical crosslinking of a polymer to form its hydrogel, might be accomplished either by casting-solvent evaporation (SC) method or by freeze–thaw...
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