mPEG-EO is widely used in the pharmaceutical and biomedical fields due to its unique properties. It is commonly employed as a surface modifier for nanoparticles and drug delivery systems, enhancing their stability and prolonging circulation time in the bloodstream. This chemical is also utilized in the development of hydrogels and biomaterials, where it improves biocompatibility and reduces immune responses. Additionally, mPEG-EO is applied in protein conjugation to increase solubility and reduce immunogenicity of therapeutic proteins. Its ability to form micelles makes it valuable in encapsulating hydrophobic drugs for targeted delivery. In research, it serves as a crucial component in studying polymer interactions and designing advanced drug carriers.