pH- and thermo-multi-responsive fluorescent micelles from block copolymers via reversible addition fragmentation chain transfer (RAFT) polymerization

Natthaporn Suchao-In, Suwabun Chirachanchai, Sébastien Perrier

Research output: Contribution to journalArticleResearchpeer-review

39 Citations (Scopus)

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)eth yl 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.

Original languageEnglish
Pages (from-to)4151-4158
Number of pages8
JournalPolymer
Volume50
Issue number17
DOIs
Publication statusPublished - 12 Aug 2009
Externally publishedYes

Keywords

  • Multi-responsive micelles
  • Poly(N-isopropylacrylamide)
  • RAFT

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