A superabsorbent polymer (SAP) (also called “hydrogel”) is a sodium salt of polyacrylic acid with the chemical formula [-CH 2 -CH (CO 2 Na) -] n, it can absorb and retain extremely large amounts of liquid relative to its own mass and volume (up to 100 ml of liquid per 1 gram of SAP). The polymer absorbs through numerous hydrogen bonds with water molecules. In distilled water, it can absorb as much as possible of its own volume, forming gel crystals containing up to 99.9% of bound water. When electrolyte solutions are absorbed, absorption decreases.
A superabsorbent polymer (SAP)
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