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Título: | Understanding the reinforcement of graphene in poly(Ether ether ketone)/carbon fibre laminates |
Autor: | Flores, Araceli CSIC ORCID; Quiles-Díaz, Susana CSIC ORCID; Enrique-Jiménez, Patricia CSIC; Martínez-Gómez, Aránzazu CSIC ORCID; Gómez-Fatou, Marián A. CSIC ORCID; Salavagione, Horacio J. CSIC ORCID | Palabras clave: | PEEK Graphene Carbon fibre laminates Matrix-fibre interaction Nanoindentation Electrical conductivity Structure |
Fecha de publicación: | 2021 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Polymers 13 (2021) | Resumen: | PEEK appears as an excellent candidate to substitute epoxy resins in carbon fibre laminates for high-performance aeronautical applications. The optimization of the properties and, in particular, of the transition region between the fibres and the matrix appear as a major issue prior to serial pro-duction. Graphene, modified with two compatibilizers, has been incorporated in the polymer layer with the purpose of imparting additional functionalities and enhancing the matrix-fibre interaction. It is found that both carbon fibres and modified graphene significantly influence the crystallization behaviour and smaller, and/or more imperfect crystals appear while the degree of crystallinity de-creases. Despite this, nanoindentation studies show that the PEEK layer exhibits significant modulus improvements (≈30%) for 5 wt.% of graphene. Most importantly, the study of the local mechanical properties by nanoindentation mapping allows the identification of remarkably high modulus values close to the carbon fibre front. Such a relevant mechanical enhancement can be associated with the ac-cumulation of graphene platelets at the polymer–fibre boundary, as revealed by electron microscopy studies. The results offer a feasible route for interlaminar mechanical improvement based on the higher density of graphene platelets at the fibre front that should promote interfacial interactions. Concerning electrical conductivity, a large anisotropy was found for all laminates, and values in the range ~10 S/cm were found for the through-thickness arrangement as a consequence of the good consolidation of the laminates. | Versión del editor: | http://dx.doi.org/10.3390/polym13152440 | URI: | http://hdl.handle.net/10261/253629 | DOI: | 10.3390/polym13152440 | Identificadores: | doi: 10.3390/polym13152440 issn: 2073-4360 |
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polymers-13-02440-v2.pdf | 4,61 MB | Adobe PDF | Visualizar/Abrir |
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