PCL(3k)-PEG(8k)-PCL(3k) is a self-assembling triblock copolymer with a hydrophilic PEG block in between hydrophobic polycaprolactone (PCL) blocks. The polymer has terminal hydroxyls for further derivatization. It can be used for drug nanocarrier formulation. The polymer is biodegradable via hydrolysis of the ester bonds. Reagent grade, for research purpose.