PCL(1k)-PEG(1k)-ALK is a click chemistry amphiphilic block copolymer with hydrophobic block made of polycaprolactone (PCL) tethered to a hydrophilic PEG. It can self-assemble in aqueous media to form micelles and be used to prepare nanoparticles for drug encapsulation in nanomedicine/drug delivery. Reagent grade, for research purpose.