Used as a reactive monomer in polymer synthesis, particularly in the development of functional hydrogels and stimuli-responsive polymers. Its carboxylic acid group enables pH sensitivity, making it valuable in drug delivery systems and biomedical applications where controlled release is required. Also employed in coatings and adhesives to improve adhesion, flexibility, and thermal stability. Commonly copolymerized with other vinyl monomers to tailor the mechanical and chemical properties of the resulting polymers.