TY - JOUR
T1 - The effect of sizing and surface oxidation on the surface properties and tensile behaviour of recycled carbon fibre
T2 - An end-of-life perspective
AU - He, Di
AU - Soo, Vi Kie
AU - Stojcevski, Filip
AU - Lipiński, Wojciech
AU - Henderson, Luke C.
AU - Compston, Paul
AU - Doolan, Matthew
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/11
Y1 - 2020/11
N2 - Carbon fibre is not widely recycled due to the inconsistent tensile properties of the recycled carbon fibre (rCF). It is unclear whether the surface treatments for virgin carbon fibre (vCF) have an impact on the quality of rCF. This paper presents an experimental investigation into the effect of epoxy sizing and electrochemical oxidation for vCF on the tensile and surface properties of rCF recycled by pyrolysis. Carbon fibre with sizing, or surface oxidation, or both, experience a reduction in tensile strength by 44.6%, 43.7% and 50.1%, respectively, during the recycling process, compared to 19.8% for un-treated fibre. Surface-treated carbon fibres exhibit more surface defects (ID/IG from 1.6 to 2.7 from Raman spectroscopy) and a smaller average crystallite size (from 7.6 nm to 6.2 nm from X-ray diffraction) after recycling. The results indicate that the interactions between the sizing agent and surface functional groups contribute to the down-cycling of carbon fibre.
AB - Carbon fibre is not widely recycled due to the inconsistent tensile properties of the recycled carbon fibre (rCF). It is unclear whether the surface treatments for virgin carbon fibre (vCF) have an impact on the quality of rCF. This paper presents an experimental investigation into the effect of epoxy sizing and electrochemical oxidation for vCF on the tensile and surface properties of rCF recycled by pyrolysis. Carbon fibre with sizing, or surface oxidation, or both, experience a reduction in tensile strength by 44.6%, 43.7% and 50.1%, respectively, during the recycling process, compared to 19.8% for un-treated fibre. Surface-treated carbon fibres exhibit more surface defects (ID/IG from 1.6 to 2.7 from Raman spectroscopy) and a smaller average crystallite size (from 7.6 nm to 6.2 nm from X-ray diffraction) after recycling. The results indicate that the interactions between the sizing agent and surface functional groups contribute to the down-cycling of carbon fibre.
KW - A. Carbon fibres
KW - B. Surface properties
KW - D. Mechanical testing
KW - E. Recycling
UR - http://www.scopus.com/inward/record.url?scp=85090856196&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2020.106072
DO - 10.1016/j.compositesa.2020.106072
M3 - Article
SN - 1359-835X
VL - 138
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
M1 - 106072
ER -