Preparation of aqueous dispersion of thermoplastic sizing agent for carbon fiber by emulsion/solvent evaporation

Isabelle Giraud (1) , Sophie Franceschi-Messant (1) , Emile Perez (1) , Colette Lacabanne (2) , Eric Dantras (2)

1 IMRCP - Interactions moléculaires et réactivité chimique et photochimique
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

In this work, different sizing agent aqueous dispersions based on polyetherimide (PEI) were elaborated in order to improve the interface between carbon fibers and a thermoplastic matrix (PEEK). The dispersions were obtained by the emulsion/solvent evaporation technique. To optimize the stability and the film formation on the fibers, two surfactants were tested at different concentrations, with different concentrations of PEI. The dispersions obtained were characterized by dynamic light scattering (DLS) and the stability evaluated by analytical centrifugation (LUMiFuge). The selected dispersions were tested for film formation ability by scanning electron microscopy (SEM), and the sizing performance was assessed by observation of the fiber/matrix interface by SEM. The results revealed that an aqueous dispersion of PEI,stabilized by sodium dodecyl sulfate as the surfactant, led to very stable sizing agent aqueous dispersion with ideal film formation and better interface adhesion.

Mots clés: Sizing; Carbon fibers; Composites Thermoplastic polymer; Aqueous dispersion; Emulsion/solvent evaporation

Domaines: Matériaux

Isabelle Giraud, Sophie Franceschi-Messant, Emile Perez, Colette Lacabanne, Eric Dantras. Preparation of aqueous dispersion of thermoplastic sizing agent for carbon fiber by emulsion/solvent evaporation. Applied Surface Science, 2013, vol. 266, pp. 94-99. ⟨10.1016/j.apsusc.2012.11.098⟩. ⟨hal-00835632⟩