PCL(1k)-PEG(3k)-PCL(1k) is a self-assembling triblock amphiphilic polymer. It can be used to encapsulate hydrophobic drug for drug delivery. The polymer can undergo hydrolytic degradation on their ester bonds. The polycaprolactone (PCL) is biodegradable via hydrolysis on the ester bonds. Reagent grade, for research purpose.