PCL(5k)-PEG(1k)-VS is a linear monofunctional block copolymer which can react with thiol in the presence of catalyst/UV initiator via thiol-ene chemistry. This amphiphilic polymer can be used to prepare nanomicellar/nanoparticles for delivering therapeutics. The arrangement of the micelles is polycaprolactone (PCL) being shielded by PEG from the water. Reagent grade, for research purpose.