PCL(1k)-mPEG(1k) is a block copolymer with polycaprolactone (PCL) as a hydrophobic segment and PEG as a hydrophilic block. The polymer is amphipathic and can self-assemble in aqueous media to form micelle which can be used to prepare nanoparticles for drug encapsulation in nanomedicine/drug delivery. The polyester PCL is biodegradable via hydrolytic attack on the ester bonds.
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