Get access
Advertisement

Debinding Mechanisms in Thermoplastic processing of a Ba0.5Sr0.5Co0.8Fe0.2O3−δ- Stearic Acid–Polystyrene Mixture

Authors

  • Mehdi Salehi,

    Corresponding author
    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Überlandstrasse 129, 8600 Dübendorf (Switzerland), Fax: (+41) 58-765-4150
    2. The Fribourg Center for Nanomaterials (FriMat) and Department of Geosciences, University of Fribourg, Chemin du Musée 6- Pérolles, 1700 Fribourg (Switzerland)
    • Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Überlandstrasse 129, 8600 Dübendorf (Switzerland), Fax: (+41) 58-765-4150
    Search for more papers by this author
  • Dr. Frank Clemens,

    Corresponding author
    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Überlandstrasse 129, 8600 Dübendorf (Switzerland), Fax: (+41) 58-765-4150
    • Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Überlandstrasse 129, 8600 Dübendorf (Switzerland), Fax: (+41) 58-765-4150
    Search for more papers by this author
  • Prof. Dr. Eugenio H. Otal,

    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstrasse 129, 8600 Dübendorf (Switzerland)
    2. UTN–Santa Cruz Regional Faculty, Av. Inmigrantes 555m, Río Gallegos (9400), Santa Cruz (Argentina)
    Search for more papers by this author
  • Dr. Davide Ferri,

    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstrasse 129, 8600 Dübendorf (Switzerland)
    Search for more papers by this author
  • Prof. Dr. Thomas Graule,

    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Überlandstrasse 129, 8600 Dübendorf (Switzerland), Fax: (+41) 58-765-4150
    Search for more papers by this author
  • Prof. Dr. Bernard Grobéty

    1. The Fribourg Center for Nanomaterials (FriMat) and Department of Geosciences, University of Fribourg, Chemin du Musée 6- Pérolles, 1700 Fribourg (Switzerland)
    Search for more papers by this author

Abstract

In the present study, we address the interaction between a thermoplastic binder system and Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) during thermal treatment of the thermoplastic feedstock. BSCF powder was coated with different amounts of stearic acid (SA) acting as a surfactant. Oxygen release from the uncoated BSCF surface changes the decomposition of polystyrene (PS) in inert atmospheres from a pyrolytic to a thermoxidative mechanism, thereby decreasing the break-down temperature and the activation energy. In mixtures with coated BSCF powder, the decomposition products of SA carbonatize the BSCF surface, which inhibits oxygen release. Mass spectrometry of the breakdown products indicates that the decomposition of SA in the presence of BSCF also modifies the decomposition pathway of PS. The influence of BSCF on the polymer decomposition reaction in air is not as strong. Oxygen diffusion seems to be responsible for the differences to pure PS in reaction rates and the activation energies.

Get access to the full text of this article

Ancillary