mPEG(750)-PCL(3k)-COOH allows self assembly when dispersed in water. The micelle structure consists of hydrophobic core (polycaprolactone (PCL)) and hydrophilic shell (PEG). It can be used to prepare drug nanocarrier in drug delivery system. The carboxylic acid (COOH) is reactive with amine via activation with HATU/EDC. Reagent grade, for research purpose.