Electrical properties studies of a Cork/TetraPak®/Paraffin wax composite

M. Carmo Lança, Stefan Peuckert, Eugen R. Neagu, Luís Gil, Paulo C. Silva, José Marat-Mendes

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Lately the electrical and dielectric properties of cork and some cork-based materials (commercial and non-commercial) have been studied in order to understand their ability to store electrical charge. The main problem found so far is related to the water content in cork, only of a few % weight, but large enough to influence greatly the conductivity of cork and, consequently, the charge storage capability. To overcome this problem cork has been combined with hydrophobic materials. In this work a commercial wax (paraffin wax) was used to produce a cork/paraffin composite by hot pressing. After milled and mixed natural cork, TetraPak® containers waste and paraffin were pressed to make plaques of a new composite. Different concentrations of cork, TetraPak® and paraffin, different granules size, different temperature and pressure were used to produce the samples. The electrical properties of the new composite were measured by the isothermal charging and discharging current method and the results compared to previously ones obtained for natural cork and other derivative products. The new composite has shown to have lower conductivity than the commercial agglomerate, which makes it a better material for charge storage.

Original languageEnglish
Pages (from-to)613-617
Number of pages5
JournalMaterials Science Forum
Volume587-588
Publication statusPublished - 1 Dec 2008
EventAdvanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM - Porto, Portugal
Duration: 1 Apr 20074 Apr 2007

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Keywords

  • Biomaterials
  • Composite
  • Cork
  • Smart sensors
  • Space charge

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