Abstract
To achieve good mechanical properties of carbon fibre-reinforced polycarbonate composites, the fibre-matrix adhesion must be dialled to an optimum level. The electrolytic surface treatment of carbon fibres during their production is one of the possible means of adapting the surface characteristics of the fibres. The production of a range of tailored fibres with varying surface treatments (adjusting the current, potential, and conductivity) was followed by contact angle, inverse gas chromatography and X-ray photoelectron spectroscopy measurements, which revealed a significant increase in polarity and hydroxyl, carboxyl, and nitrile groups on the fibre surface. Accordingly, an increase in the fibre-matrix interaction indicated by a higher interfacial shear strength was observed with the single fibre pull-out force-displacement curves. The statistical analysis identified the correlation between the process settings, fibre surface characteristics, and the performance of the fibres during single fibre pull-out testing.
Highlights
Improving mechanical properties through the addition of reinforcing fibres is a common approach used in a range of thermoplastic materials [1,2,3,4]
A set of on-purpose fibre samples were produced and characterized with a range of surface characterization techniques (IGC, samples were produced and characterized with a range of surface characterization techniques (IGC, X-ray Photoelectron Spectroscopy (XPS), contact angles (CA)), and single fibre pull-out testing was used for the quantification of the interfacial shear
XPS, CA), and single fibre pull-out testing was used for the quantification of the interfacial shear strength between the fibre and the polycarbonate matrix
Summary
Improving mechanical properties through the addition of reinforcing fibres is a common approach used in a range of thermoplastic materials [1,2,3,4]. To enable and exploit the mechanical property profile of fibre-reinforced thermoplastic composites, fibre-matrix adhesion must be at an optimum level [1,2,3]. Each combination of fibre and matrix material will have its own ideal approach; for polycarbonate, specific studies have been conducted, mainly with respect to oxygen plasma-treated carbon fibres [7,8,9] or electrochemical oxidation [10,11,12,13], generally showing a significant increase in adhesion to polycarbonate after treatment.
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