PCL(2k)-PEG(3k)-Thiol is a self-assembling block copolymer containing a hydrophilic PEG block and hydrophobic polycaprolactone (PCL) block. The polymer has terminal thiol on one end and hydroxyl on another end for further derivatization. The ester bonds of the polymer can be cleaved via hydrolysis. Reagent grade, for research purpose.