1. Glass Transition Temperature Depression at the Percolation Threshold in Carbon Nanotube-Epoxy Resin and Polypyrrole-Epoxy Resin Composites
- Author
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Sophie Barrau, A. Bernes, Philippe Demont, Colette Lacabanne, Céline Maraval, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)
- Subjects
Materials science ,Polymers and Plastics ,Matériaux ,Carbon nanotubes ,02 engineering and technology ,010402 general chemistry ,Polypyrrole ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,chemistry.chemical_compound ,Differential scanning calorimetry ,Materials Chemistry ,Epoxy resin ,Composite material ,Electrical percolation threshold ,Nanocomposite ,Organic Chemistry ,Percolation threshold ,Epoxy ,Dynamic mechanical analysis ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,chemistry ,visual_art ,Percolation ,visual_art.visual_art_medium ,0210 nano-technology ,Glass transition - Abstract
International audience; The glass transition temperatures of conducting composites, obtained by blending carbon nanotubes (CNTs) or polypyrrole (PPy) particles with epoxy resin, were investigated by using both differential scanning calorimetry (DSC) and dynamical mechanical thermal analysis (DMTA). For both composites, dc and ac conductivity measurements revealed an electrical percolation threshold at which the glass transition temperature and mechanical modulus of the composites pass through a minimum.
- Published
- 2005