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材料科学
复合材料
极限抗拉强度
摩擦学
表面改性
抗弯强度
弯曲模量
结晶度
石墨烯
纳米复合材料
聚合物
化学工程
工程类
纳米技术
作者
J.A. Puértolas,Miguel Castro,Jacob Morris,R. Rı́os,Alejandro Ansón‐Casaos
出处
期刊:Carbon
[Elsevier]
日期:2019-01-01
卷期号:141: 107-122
被引量:144
标识
DOI:10.1016/j.carbon.2018.09.036
摘要
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.
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