PCL(3k)-PEG(3k)-N3 is a linear monofunctional amphiphilic block copolymer. The polymer consists of hydrophobic polycaprolactone (PCL) and hydrophilic PEG. It can be used to encapsulate hydrophobic drugs for targeted drug delivery. The polymer can undergo click reaction with alkyne via strain-promoted azide-akyne cycloaddition (SPAAC) or copper-catalyzed azide-akyne cycloaddition (CuAAC). Reagent grade, for research purpose.