{
    "content": "The monomer structures used for synthesizing hydrophilic polymers include primary amines and carboxylic acids in polyamides, aliphatic alcohols and carboxylic acids in polyesters, ether groups in polyethers, and alcohol groups with cyanate groups in polyurethanes, where the presence of functional groups such as amides, carboxylic acids, and alcohols enhances the hydrophilicity by providing sites for hydrogen bonding and ionic interactions with water."
}