Аннотация:Reversible addition-fragmentation chain transfer (RAFT) polymerization is an important technique for surface functionalization of nanoparticles. It provides a powerful toolbox to tune the properties of composites. The RAFT agent, 4-cyanopentanoic acid dithiobenzoate (CPDB), was anchored on silica nanoparticles via surface silane chemistry with different graft densities. Methacrylic acid (MAA) and 6-azidohexyl methacrylate (AHMA) were polymerized on nanoparticles in a controlled manner via the RAFT technique. A variety of polyMAA (PMAA) and polyAHMA (PAHMA) brushes with different polymer chain lengths and low PDIs (<1.2) were prepared. The nanoparticles were characterized by FTIR, TGA, 1H NMR and TEM. Postfunctionalization of the surface attached polymers was conducted using bio-functional groups and the resulting polymer nanocomposites may have important biomedical applications.
