Authors: Raghuraman, G.K.; Dhamodharan, R.

Source: Journal of Nanoscience and Nanotechnology, Volume 6, Number 7, July 2006 , pp. 2018-2024(7)

Publisher: American Scientific Publishers

Abstract:

The synthesis of methyl methacrylate (MMA) brush from the surface of magnetite nanoparticles (core-shell structure), from initiator moieties anchored covalently to the nanoparticles, via room temperature atom transfer radical polymerization (ATRP) is described. The surface-initiated polymerization was carried out from a surface-confined initiator containing a 2-bromoisobutyrate moiety with Cu(I)Br/PMDETA catalytic system. The initiator moiety was covalently anchored to the nanoparticles via a two step modification reaction scheme. Controlled polymerization was observed if ethyl-2-bromoisobutyrate (2-EiBrB) was added as a free/sacrificial initiator. A linear increase of molecular weight and a narrow molecular weight distribution of the PMMA formed in solution, provide evidence for a controlled surface-initiated polymerization, leading to surface-attached polymer brushes under mild conditions. The grafted PMMA provides good stability and dispersibility for the nanoparticles in organic solvents.

Keywords: CORE-SHELL; MAGNETITE; NANOPARTICLES; AMBIENT TEMPERATURE; ATRP; SURFACE-INITIATED POLYMERIZATION

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2006.343

Publication date: 2006-07-01

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