Mechanical Characterization of Carbon Fibres Recycled by Steam Thermolysis: A Statistical Approach

Abstract

is properly cited. e recent development of technologies for recycling carbon fibre reinforced plastics (CFRPs) leads to the need to evaluate the mechanical response of recycled carbon fibres. As these fibres are likely to be degraded during the recycling treatment, it is very important to determine their tensile residual properties so as to evaluate their ability as reinforcement for new composite materials. Carbon fibres reclaimed by a steam-thermal treatment applied to degrade the epoxy resin matrix of a CFRP are here analysed. Two conditions were chosen so as to reach two degradation efficiency levels of the steam thermolysis. Several carbon fibre samples were selected for mechanical testing carried out either on single filaments using single fibre tensile tests or on fibre tows using bundle tensile tests. It is shown that the single fibre tensile test leads to a wide variability of statistical parameters derived from the analysis. Bundle tensile tests results were able to indicate that fibre strength of recycled carbon fibre is similar to corresponding as-received carbon fibres thanks to a statistically relevant database. Wide number of tested filaments enabled indeed to obtain low scatters.

Thermal analysis of carbon fibre reinforced polymer decomposition

“…As an alternative, the very slow heating rate is applied in this study during the oxidative reaction to expose only the minimum oxidative reaction and completely remove the epoxy resin and pyrolytic carbon from reclaimed-cf 4.5. Chemical analysis of CFRP thermal decomposition Generally, epoxy resins, used in the high-end application industry, show appropriate thermal resistance performances in addition to the required high mechanical properties (Boulanghien et al 2018). However, in a nitrogen atmosphere, the amount of oxygen-containing functional groups on the surface of the reclaimed-CF can be decomposed significantly.…”

A Sustainable Approach to the Low-Cost Recycling of Waste Glass Fibres Composites towards Circular Economy

“…Focusing on sustainable and green chemistry aspects [26][27][28][29][30], chemical methods which are based on supercritical solvents in which an organic solvent or water with or without catalysts are the most promising methods. These methods can retain fibre strength up to >90% and generate a limited quantity of by-products and wastes [31][32][33][34][35]. Nevertheless, they are still considered high energy-consuming processes because of the fact that reaching the supercritical status of solvents requires high processing temperatures and extremely high pressures.…”

Fully Bio-Based Epoxy-Amine Thermosets Reinforced with Recycled Carbon Fibers as a Low Carbon-Footprint Composite Alternative

“…Even though pyrolyzed carbon fibers lose ca. 20% of their stiffness and 10% of their strength, 34,35 their fiber tensile strength modulus is ca. 3.5−4 GPa, which is still larger than those of natural and glass fibers.…”

“…Even though pyrolyzed carbon fibers lose ca. 20% of their stiffness and 10% of their strength, , their fiber tensile strength modulus is ca. 3.5–4 GPa, which is still larger than those of natural and glass fibers. ,,, This means that, for the same fiber content, recycled carbon fibers confer better mechanical properties to the composites.…”

“…20% of their stiffness and 10% of their strength, , their fiber tensile strength modulus is ca. 3.5–4 GPa, which is still larger than those of natural and glass fibers. ,,, This means that, for the same fiber content, recycled carbon fibers confer better mechanical properties to the composites. In that regard, few studies are found in the literature concerning matrix reinforcement by recycled carbon fibers when compared to other class of fibers.…”