Influence of specific mechanical energy during compounding in a co-kneader on electrical and rheological properties of multiscale composite materials

Axel Salinier (1) , Sylvie Dagréou (1) , Arthur Visse (1) , Nuria Navascués (2) , Frédéric Léonardi (1) , Christophe Derail (1)

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 INA - Instituto de Nanociencia de Aragón [Saragoza, España]

This paper focuses on the effect of different scales of fillers, from nano to macrometer, on the rheological and electrical behaviour of thermoplastic-based composites. Composites based on poly (etherimide) matrix (PEI) with multiscale reinforcement are processed by melting in a co-kneader to disperse homogeneously carbon nanotubes and glass fibers. We clearly demonstrate the strong link between the liquid-solid transition and the electrical conductivity. We show that the specific mechanical energy is a key parameter. Glass fibers allow to increase the electrical conductivity of blends based on carbon nanotubes and to obtain a lower decreasing of conductivity at the liquid transition which takes place in the same time as rheological and electrical parameters.

Mots clés: Polymer; Rheology; poly(etherimide); Multiwalled carbon nanotubes; Co-kneading; Composite materials; Electrical threshold

Domaines: Polymères; Matériaux; Chimie théorique et/ou physique; Chimie analytique

Axel Salinier, Sylvie Dagréou, Arthur Visse, Nuria Navascués, Frédéric Léonardi, et al.. Influence of specific mechanical energy during compounding in a co-kneader on electrical and rheological properties of multiscale composite materials. Composites Communications, 2020, 17, pp.154-162. ⟨10.1016/j.coco.2019.12.003⟩. ⟨hal-02429046⟩