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Journal of Materials Science

, Volume 43, Issue 10, pp 3638–3642 | Cite as

Spherical particles of phenolic resin treated with iron oxide

  • Francisco J. dos Santos
  • Miguel JafelicciJr.
  • Cláudio G. dos-SantosEmail author
  • Rosângela A. de Souza
  • Vânya M. D. Pasa
Article

Abstract

This paper describes the preparation and characterization of phenolic resins’ thermospheres covered by a magnetic phase of iron oxide. The thermospheres were prepared by allowing phenol and formaldehyde to react under dispersion polymerization conditions and the iron oxide phase was incorporated in situ onto the phenolic resin particles by adding concentrated NH3 to FeCl2 in DMSO. This reaction was conducted at 70 °C under nitrogen atmosphere in a controlled temperature vessel, and the modified resin was isolated and dried in vacuo. Both pure and modified resins were characterized by DRX, TG-DTA, and MEV/EDX. The modified particles were attracted by a magnetic field, indicating the fixation of magnetic iron oxide. No diffraction peaks were observed in DRX analysis; thermal analysis (DTA) of both pure and modified resins presented exothermic events between 300 and 680 °C, and 300 and 570 °C, respectively, indicating the microstructure of the resin was modified after the treatment. Thermogravimetric analysis (TGA) of the pure resin registered a 2.0% residue, compared to 8.0% for the modified resin. These residues correspond to about 7.0% of fixed iron oxide. MEV/EDX analyses confirm the modification of the resins by the process of fixing iron oxide.

Keywords

Magnetite Iron Oxide Dispersion Polymerization Magnetic Iron Oxide Green Rust 

Notes

Acknowledgements

This work was supported by the following Brazillian agencies: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Francisco J. dos Santos
    • 1
  • Miguel JafelicciJr.
    • 1
  • Cláudio G. dos-Santos
    • 2
    Email author
  • Rosângela A. de Souza
    • 3
  • Vânya M. D. Pasa
    • 3
  1. 1.Instituto de QuímicaUNESPAraraquaraBrazil
  2. 2.Departamento de Química, ICEBUFOPOuro PretoBrazil
  3. 3.Departamento de Química, ICEXUFMGBelo HorizonteBrazil

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