PCL(2k)-PEG(3k)-MAL is a block copolymer containing polycaprolactone (PCL) (hydrophobic) and PEG (hydrophilic). Upon dispersion in water, the polymer self-assembles to form micelles with PCL core and PEG shell. The core can be used as reservoir for hydrophobic drugs while the shell can provide protection from degradation (enzymatic/hydrolysis). The maleimide is reactive with thiol molecule at pH 6.5-7.5. Reagent grade, for research purpose.