Polystyrene- and poly(3-vinylpyridine)-grafted magnetite nanoparticles prepared through surface-initiated nitroxide-mediated radical polymerization

Ryosuke Matsuno, Kazuya Yamamoto, Hideyuki Otsuka, Atsushi Takahara

Research output: Contribution to journalArticle

192 Citations (Scopus)

Abstract

Polymer-grafted magnetite (Fe3O4) nanoparticles (diameter about 10 nm) were prepared through a direct polymer grafting reaction from their surfaces. The chemisorbed initiator (TEMPO-based alkoxyamine) for nitroxide-mediated radical polymerization with a phosphoric acid group gave controlled polystyrene (PS) and poly(3-vinylpyridine) (P3VP) graft layers on the surface. The graft densities of polymers on the surfaces of magnetite particles were estimated at 0.12-0.20 chains/nm2 by thermogravimetric analysis (TGA). The improvement in the dispersibility of PS-modified magnetite in good solvents was verified by ultraviolet-visible (UV-vis) absorption spectroscopy, transmission electron microscopy (TEM), and dynamic light scattering (DLS). In the case of P3VP-modified magnetite, the particles were stably dispersed in good solvents, by protonation, in acid solution, and by quarternization with iodomethane, in neutral aqueous solution. The magnetic response of the polymer-grafted magnetite against an external magnetic field was confirmed in the stable dispersion.

Original languageEnglish
Pages (from-to)2203-2209
Number of pages7
JournalMacromolecules
Volume37
Issue number6
DOIs
Publication statusPublished - Mar 23 2004

Fingerprint

Magnetite Nanoparticles
Ferrosoferric Oxide
Magnetite nanoparticles
Polystyrenes
Magnetite
Free radical polymerization
Polymers
Grafts
Protonation
Phosphoric acid
Dynamic light scattering
Absorption spectroscopy
Thermogravimetric analysis
Magnetic fields
Transmission electron microscopy
Acids
3-vinylpyridine

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Polystyrene- and poly(3-vinylpyridine)-grafted magnetite nanoparticles prepared through surface-initiated nitroxide-mediated radical polymerization. / Matsuno, Ryosuke; Yamamoto, Kazuya; Otsuka, Hideyuki; Takahara, Atsushi.

In: Macromolecules, Vol. 37, No. 6, 23.03.2004, p. 2203-2209.

Research output: Contribution to journalArticle

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