Abstract
Abstract Well-defined pH- and thermo- multi-responsive fluorescent micelles based on the self-assembly of diblock copolymers poly[( N -isopropyl-acrylamide- co - N -vinylcarbazole)- b -2-(dimethylamino)ethyl acrylate], (PNIPAAM- co -PNVC)- b -PDMAEA, are described. The diblock copolymers are prepared via the reversible addition fragmentation chain transfer (RAFT) copolymerization of N -isopropyl-acrylamide (NIPAAM) and N -vinylcarbazole (NVC) followed by chain extension in presence of 2-(dimethylamino)ethyl acrylate) (DMAEA). The micelles are formed in aqueous solutions in a wide range of temperature (25–60 °C), and their sizes increase from 40 to 65 nm when varying pH from basic to acidic. The cross-linking of the PDMAEA-containing shell with 1,2-bis(2-iodoethoxy)ethane (BIEE) results in spherical soft nanoparticles which size is increased by 20–25% when compared to the micelles. The presence of NVC in concentrations as low as 4% in the core of the micelles allow the nanoparticles to be tagged by fluorescence, making them well suited for therapeutic applications.
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