Used in drug delivery systems to enhance solubility and circulation time of therapeutic agents. Its acrylate end allows for crosslinking in hydrogel formation, useful in tissue engineering and controlled release applications. The hydroxyl-terminated PEG structure supports bioconjugation and surface modification of biomaterials, improving biocompatibility and reducing protein adsorption. Commonly applied in biomedical research, coatings for medical devices, and development of stimuli-responsive materials.