CNT coating and anchoring beads enhance interfacial adhesion in fiber composites

[Display omitted] •Thin CNT coating was deposited on glass fibers, using evaporation-driven self-assembly.•Epoxy beads were applied on the coating, implementing the Plateau-Rayleigh liquid instability.•The treated fibers were embedded in epoxy matrix, and fiber pullout tests demonstrated a significa...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2023-04, Vol.167, p.107427, Article 107427
Main Authors: Ghosh, Sabyasachi, Greenfeld, Israel, Daniel Wagner, H.
Format: Article
Language:English
Subjects:
Coated composites
Interface
Mechanical and other functional properties
SWCNT anchored epoxy beads
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Summary:[Display omitted] •Thin CNT coating was deposited on glass fibers, using evaporation-driven self-assembly.•Epoxy beads were applied on the coating, implementing the Plateau-Rayleigh liquid instability.•The treated fibers were embedded in epoxy matrix, and fiber pullout tests demonstrated a significant simultaneous increase in both strength (140%) and toughness (400%).•The standalone coated and beaded fibers are excellent candidates for both rigid and flexible functional composites. The fiber-matrix interface is a critical component in fiber composites, affecting both their strength and toughness. In this study, glass fibers were treated with thin coating of CNT bundles, creating a strong scaffold using evaporation-driven deposition. Epoxy beads were applied to the coating, implementing the Plateau-Rayleigh liquid instability phenomenon. The coated and beaded fibers were embedded in epoxy matrix and subjected to pullout tests, yielding a significant increase of 140% in strength and 400% in toughness, compared to untreated fibers. Electron microscopy and 3D micro-CT imaging elucidated the improvement mechanisms, including strengthening and toughening of the fiber-matrix interphase by the scaffold and anchoring of the epoxy beads. Composites reinforced by such fibers should potentially lead to significant enhancement of simultaneously both strength and toughness. Similarly, the mechanical and electrical properties of flexible functional composites can be enhanced by weaving the coated and beaded fibers into a smart fabric.
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2023.107427