Used as a key intermediate in the synthesis of functionalized polymers and surface modifiers, particularly in the development of specialty coatings and adhesives. Its extended oligoethylene glycol-like chain with a terminal carboxylic acid and chloroalkyl group allows for dual reactivity, enabling covalent attachment to both organic and inorganic substrates. Commonly employed in modifying surfaces for biomedical applications, such as improving biocompatibility of implants or immobilizing biomolecules on sensors. Also utilized in the preparation of dendrimers and other structured macromolecules where controlled spacing and specific functional end groups are required.