Glass Transition Temperature Depression at the Percolation Threshold in Carbon Nanotube–Epoxy Resin and Polypyrrole–Epoxy Resin Composites
✍ Scribed by Sophie Barrau; Philippe Demont; Céline Maraval; Alain Bernes; Colette Lacabanne
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 121 KB
- Volume
- 26
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: 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.
DC conductivity, σ~dc~, as a function of the conducting filler concentration of the CNT– (▪) and PPy– (○) epoxy resin composites.
magnified imageDC conductivity, σ~dc~, as a function of the conducting filler concentration of the CNT– (▪) and PPy– (○) epoxy resin composites.