Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Puértolas, J.A. (Universidad de Zaragoza) ; Castro, M. (Universidad de Zaragoza) ; Morris, J.A. ; Ríos, R. (Universidad de Zaragoza) ; Ansón-Casaos, A.

Resumen: Poly(ether ether ketone) (PEEK) is a relevant thermoplastic in industry and in the biomedical sector. In this work, the lubricant capability of graphene nanoplatelets (GNPs) is used for improving the PEEK wear properties. Nanocomposites were prepared by solvent-free melt-blending and injection molding at various compositions between 1 and 10 wt. % of GNPs. The Raman G band shows a progressive increment proportional to the bulk GNP percentage. From calorimetric data, the polymer matrix structure is interpreted in terms of a 3-phase model, in which the crystalline phase fluctuates from 39 to 34% upon GNP addition. Thermal conductivity varies in accordance with the polymer crystallinity. Tensile and flexural tests show a progressive increase in the modulus, as well as a decrease in the fracture strength and the work of fracture. Most important, the composite surface undergoes a substantial improvement in hardness (60%), together with a decrease in the coefficient of friction (-38%) and a great reduction in the wear factor (-83%). Abrasion and fatigue wear mechanisms are predominant at the lowest and highest GNP concentrations respectively. In conclusion, GNPs are used without any chemical functionalization as the filler in PEEK-based materials, improving the surface hardness and the tribological properties.

Idioma: Inglés

DOI: 10.1016/j.carbon.2018.09.036

Año: 2019

Publicado en: Carbon 141 (2019), 107-122
ISSN: 0008-6223

Factor impacto JCR: 8.821 (2019)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 32 / 314 = 0.102 (2019) - Q1 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 26 / 158 = 0.165 (2019) - Q1 - T1

Factor impacto SCIMAGO: 2.234 - Materials Science (miscellaneous) (Q1) - Chemistry (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E11-17R
Financiación: info:eu-repo/grantAgreement/ES/DGA/T03-17R
Financiación: info:eu-repo/grantAgreement/ES/DGA/T48-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/ENE2016-79282-C5-1-R
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ2015-TEC-04

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)