Abstract
The synthesis of a gold nanoparticle (AuNP) coated with a well-defined polymer is reported. The AuNP coated with an initiator group for living radical polymerization was prepared by the simple one-pot reduction of tetrachloroaurate with sodium borohydrate in the presence of an initiator group-holding disulfide. The surface-initiated living radical polymerization of methyl methacrylate (MMA) mediated by a copper complex was carried out with the initiator-coated AuNP in the presence of a “sacrificial” free initiator. Living polymerization proceeded exhibiting a first-order kinetics of monomer consumption and an evolution of molecular weight of the graft polymer proportional to monomer conversion, thus providing well-defined, low-polydispersity graft polymers with an approximate graft density of 0.3 chains/nm2. Transmission electron microscopic observations of as-cast films of the AuNPs coated with PMMAs (PMMA−AuNPs) revealed that the particles were well dispersed in the polymer matrix without forming aggreg...
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