Characterisation of carbon fibres recycled from carbon fibre/epoxy resin composites using supercritical n-propanol

Jiang, Guozhan; Pickering, Simon; Lester, Edward; Turner, T.A.; Wong, Kok Hoong; Warrior, N.A.

doi:10.1016/j.compscitech.2008.10.007

Cited by 219 publications

(138 citation statements)

References 21 publications

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“…The combination of adding a coupling agent and removing the epoxy sizing yielded the highest IFSS, where the effects of adding the coupling agent were more significant than removing the sizing agent. The addition of the coupling agent brought the IFSS values for the carbon fibre/polypropylene system in line with values reported in the literature for VCF epoxy [26,38,39]. The XPS analysis of the surface composition indicated an increase in nitrogen at the surface of the desized fibres.…”

Section: The Effect Of Coupling Agentsupporting

confidence: 68%

“…Samples were produced using the virgin fibre (with epoxy sizing) only. It was found that the VCF.EP benchmark had an apparent IFSS of 45.8 ± 4.6 MPa, which is within the range of values reported in the literature for similar systems [26,38,39]. A summary of the recorded IFSS data is given in Table 2.…”

Section: Resultsmentioning

confidence: 49%

“…3, where the Weibull parameters r 0 and m could be estimated using a linear least squares regression analysis. The characteristic strength (Weibull scale parameter) r 0 , is the maximum strength that 63 % of the weakest fibres in the population can achieve [26]. The shape parameter m describes the spread of the strength distribution, where lower values indicate a broader distribution.…”

Section: Single Filament Tensile Testmentioning

confidence: 99%

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The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

et al. 2016

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The objective of this study was to investigate the feasibility of combining discontinuous recycled carbon fibres with polypropylene, to produce a low-cost, high specific stiffness material for high-volume applications. The inherent low affinity of carbon fibre and polypropylene motivated a detailed study of the surface characteristics of carbon fibre and interfacial behaviour between the two materials, using the microbond test. The effects of removing the sizing from the fibres, as well as introducing a maleic anhydride-grafted polypropylene coupling agent, were extensively investigated. Polypropylene was found to degrade when prepared under atmospheric conditions; therefore, it was necessary to form droplets under nitrogen. Removal of the sizing from the fibre using pyrolysis and solvolysis techniques altered the surface morphology of the fibre and increased the interfacial shear strength (IFSS) by 4 and 33 %, respectively. A more significant improvement in the fibre-matrix adhesion was achieved by adding a maleic anhydride coupling agent at 2 wt%, which increased the IFSS by 320 %.

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Section: The Effect Of Coupling Agentsupporting

confidence: 68%

Section: Resultsmentioning

confidence: 49%

Section: Single Filament Tensile Testmentioning

confidence: 99%

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The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

et al. 2016

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“…Notwithstanding the recycling processes, the recycled carbon fibres are usually in a fluffy short form, with a length of about 3-12 mm and retaining about 70-100% of the original fibres' strength (Jiang et al 2009;Meyer et al 2009;Yip et al 2002). Previous research mainly focuses on the development of recycling processes and how to reuse these recycled fibres.…”

Section: Introductionmentioning

confidence: 99%

The shear viscosity of carbon fibre suspension and its application for fibre length measurement

2015

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. (2016) The shear viscosity of carbon fibre suspension and its application for fibre length measurement. Rheologica Acta, 55 (1). pp. A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThe viscosity of short carbon fibre suspensions in glycerol aqueous solution was measured using a bespoke vane-in-cup viscometer, where the carbon fibre has an aspect ratio from 450 to 2209. In the semi-concentrated regime, nL 3 ranging from 20 to 4400, the suspensions demonstrated strong shear-thinning characteristics particularly at higher concentrations. The shear-thinning characteristic is strongly related to the crowding factor proposed by Kerekes, indicating that non-hydrodynamic interactions occur in the suspensions. The influence of fibre bending on viscosity emerges when the bending ratio is lower than 0.0028. An empirical model based on transient network formation and rupture was proposed and used to correlate the relative viscosity with fibre concentration nL 3 and shear rate. Based on the model, a viscosity method is established to analyse the fibre length by measuring the viscosity of the fibre suspension using a bespoke vane-in-cup viscometer.

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“…The main focus in recycling CFRP is to produce clean and resin-free recovered carbon fiber (rCF) so that it can be reused in producing new end-products. In addition, the recycling process should be carried out without damaging the surface and decrease the mechanical properties of the rCF [6]. Pyrolysis has been commercially used in recycling CFRP [7].…”

Section: Introductionmentioning

confidence: 99%

Glycolysis of carbon fiber-epoxy unidirectional mat catalysed by sodium hydroxide

Zaini

Badri

2014

AIP Conference Proceedings

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Abstract. This study was conducted to recycle carbon fibre-epoxy (CFRP) composite in woven sheet/ mat form. The CFRP was recycled through glycolysis with polyethlyene glycol (PEG 200) as the solvent. The CFRP was loaded into the solvent at a ratio of 4:1 (w/w). PEG200 was diluted with water to a ratio of 80:20 (v/v). This reaction was catalysed by sodium hydroxide (NaOH) solution with varying concentrations at 1.5, 1.7 and 1.9% (w/v). The glycolysis was conducted at 180-190 ºC. The recovered CF (rCF) was analysed using Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) while the degraded solution was analysed using FTIR and the epoxy content was determined. The FTIR spectrum of the rCF exhibited the disappearance of the COC peak belonged to epoxy and supported by the SEM micrographs that showed clear rCF. On the other hand, the analysed filtrate detected the disappearance of oxygen peak element in the EDX spectrum for all rCF samples. This gave an indication that the epoxy resin has been removed from the surface of the carbon fiber.

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Characterisation of carbon fibres recycled from carbon fibre/epoxy resin composites using supercritical n-propanol

Cited by 219 publications

References 21 publications

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

The shear viscosity of carbon fibre suspension and its application for fibre length measurement

Glycolysis of carbon fiber-epoxy unidirectional mat catalysed by sodium hydroxide

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