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Self‐healing interfaces of poly(methyl methacrylate) reinforced with carbon fibers decorated with carbon quantum dots
Author(s) -
Duarte Érica Correia,
Oréfice Rodrigo Lambert
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49644
Subject(s) - materials science , composite material , methyl methacrylate , methacrylate , self healing , polymer , poly(methyl methacrylate) , fiber , surface modification , bending , chemical engineering , polymerization , medicine , alternative medicine , pathology , engineering
Fiber‐polymer matrix interfacial debonding is often observed when mechanical loads are applied to fiber reinforced polymer composites. These defects usually end‐up leading to a catastrophic fracture of the composites. In this work, carbon quantum dots (CDs) were incorporated on the surface of carbon fibers (CF), and poly(methyl methacrylate) (PMMA) composites with these modified fibers were able to restore their original properties after been previously damaged. To this end, CDs were synthesized and used to decorate the surface of CF. These decorated CF were then incorporated into PMMA by using a high intensity mixer. The prepared composites were submitted to dynamic mechanical, three‐point bending and self‐healing tests. Fluorescent CDs with diameters of 10 nm and functional groups, such as amine and carboxylic groups were successfully synthesized by the microwave pyrolysis method. The deposition of CDs on the surface of CF was evaluated and quantified by UV–vis spectroscopy and 1.2 wt.% of CDs on CF was determined. Composites with different surface treatments (including the presence of CD) did not show significant differences in strength, stiffness and damping, suggesting that the surface treatments on CF did not lead to major changes in the degree of interfacial interaction. Self‐healing tests showed that damaged composites with CD decorated CF were able to restore their original properties, while no self‐healing effect was noted in composites with no CD on CF. The observed self‐healing behavior between PMMA and CF decorated with CD is due to the interactions between chemical groups on the surface of the CD and PMMA. Thus, damages related to fiber‐matrix interfacial detachments can be repaired through reversible interactions based on CD.

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