Used as a crosslinking agent in polymer chemistry, particularly in the modification of resins and copolymer systems. Its dual functionality allows it to bridge polymer chains through the bromomethyl group and the vinyl group, enhancing thermal and mechanical stability. Commonly employed in the synthesis of functionalized polystyrenes and as a monomer in specialty copolymers for coatings and adhesives. Also serves as an intermediate in the preparation of ion-exchange resins and functional polymers used in solid-phase synthesis and catalysis.