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Lafabrier, A., Fahs, A., Louarn, G., Aragon, E. & Chailan, J.-F. (2014) Experimental evidence of the interface/interphase formation between powder coating and composite material. Prog. Org. Coat. 77 1137–1144.
Added by: Laurent Cournède (2016-03-10 21:01:55) |
| Type de référence: Article DOI: 10.1016/j.porgcoat.2014.03.021 Numéro d'identification (ISBN etc.): 0300-9440 Clé BibTeX: Lafabrier2014 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: Epoxy resin, epoxy-resins, failure, gradient interphase, improvement, Interface, Interphase, mechanical-properties, phase-separation, poly(ether sulfone), polyethersulfone, Polymer-matrix composites, polymers, Powder coating Créateurs: Aragon, Chailan, Fahs, Lafabrier, Louarn Collection: Prog. Org. Coat. |
Consultations : 1/710
Indice de consultation : 5% Indice de popularité : 1.25% |
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The present study focuses on the physicochemical characterization of the interface between an epoxy/polyester-based powder coating and an epoxy/thermoplastic-based composite material. An inmold process has been used for the powder coating deposition on carbon/glass fibers reinforced composite substrates, and different methods have been performed to characterize the interface. We evidence here the strong dependence of the structural, chemical and thermal behaviors of the interface on the cure time/temperature conditions at which the powder coating was crosslinked. At a low crosslinking rate of coating (similar to 48\%), experimental results reveal the development of a large heterogeneous organic/organic interphase between coating and substrate. However, thin interphases have been detected when the crosslinking rate goes beyond 69\%. Besides, a phase segregation of thermoplastic additive within the composite matrix was identified in the formation of this interphase. Energy-dispersive X-ray spectroscopy (EDS) as well as FTIR/Raman experiments enabled us to put in evidence the diffusion process of the thermoplastic additive toward the coating. From thermal analysis, glass transition temperature Tg for both components was observed, which confirm the proposed mechanism. This study highlights the importance of the thermal processes on the complex competition between the interdiffusion between two epoxy matrix and the existence of thermoplastic toughening agent at the interface of powder coating and composite material. (C) 2014 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |