A Hydrogel can be described as amalgamation monomer units linked to form a water soluble polymer which is further cross-linked to form an insoluble network. It is a water swollen network polymer. Hydrogels are already used in manufacturing of soft contact lenses and gelatin desserts. These cross-linked bonds may be covalent, ionic, hydrogen or simply physical entanglements having important role in determining physical characteristics of it. Amount of water present in the swollen state of hydrogel determines its properties and characteristics. Usually, higher the water content, the material has higher application potential. It can be utilised in various forms such as absorbent material, soft tissue renewal material, membrane for separation and moisture retention in soil. In addition to that, there has been substantial interest in altering the unique characteristics of hydrogel in controlled release technological area.
STRUCTURE AND PHYSICAL PROPERTIES OF HYDROGEL