Used as a crosslinking agent in polymer chemistry, particularly in the modification of polystyrene and other vinyl-based polymers. Its vinyl group enables participation in free radical polymerization, while the bromobutyl chain acts as a linker or spacer, allowing functionalization with nucleophiles or further alkylation. Commonly employed in the synthesis of functional resins, dendrimers, and surface-grafted materials for catalysis or sensing. Also serves as an intermediate in the preparation of quaternary ammonium compounds and ionic liquids. Its bifunctional nature makes it valuable in creating tailored polymeric architectures for specialty materials.