PCL(1k)-PEG(8k)-PCL(1k) is an amphipathic ABA triblock copolymer containing two hydrophobic polycaprolactone (PCL) blocks and hydrophilic PEG block. The polymer is biodegradable via hydrolytic attack on the ester bonds and can be used to prepare nanoparticles/nanomicellars for targeted drug delivery. Reagent grade, for research purpose.