{
    "content": "Monomers used for synthesizing hydrophilic polymers include poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA), which contain hydroxyl (-OH) and carboxyl (-COOH) functional groups, respectively; these functional groups enhance hydrophilicity by engaging in hydrogen bonding with water, thereby increasing the affinity of the polymers for moisture and improving water retention."
}