Copolymères amphiphiles biodégradables pour la vectorisation

The development of controlled drug delivery systems is today a topic of an intense research activity. In this field, biocompatible and (bio)degradable polymers are particularly studied. The production of nanosized particles (polymer micelles, nanoparticles,...) generally requires the elaboration of functional amphiphilic copolymers able to stabilize efficiently these colloidal dispersions. Various strategies to synthesize such copolymers keeping their (bio)degradability are described here. The complexity of these amphiphilic materials will be gradually increased in parallel to the improvement of the nanocarriers properties

Synthesis of novel amphiphilic and pH-sensitive ABC miktoarm star terpolymers

Novel amphiphilic ABC miktoarm star terpolymers were synthesized that consist of hydrophilic poly( ethylene oxide) (PEO), hydrophobic poly(is an element of-caprolactone) (PCL), and pH-sensitive poly(2-vinylpyridine) (P2VP), thus a water-soluble block upon protonation. In the first step, poly( ethylene oxide monomethyl ether) (MPEO) was capped by one omega-epoxy end group by reaction of the original hydroxy end group with epichlorohydrin. MPEO-b-P2VP diblock copolymers were prepared by nucleophilic addition of living P2VP-Li+ chains onto the epoxy group of MPEO's. Finally, the hydroxy group formed at the junction of the MPEO and P2VP blocks was used to initiate the ring-opening polymerization of is an element of-caprolactone in the presence of tin octoate. The ABC starshaped triblocks were characterized by H-1 NMR spectroscopy and size exclusion chromatography