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    Using redox active molecules to build multilayered architecture on carbon fibers and the effect on adhesion in epoxy composites

    Year: 2021

    Journal: Compos. Sci. Technol., Volume 202, JAN 20

    Authors: Stanfield, Melissa K.; Eyckens, Daniel J.; Medard, Jerome; Decorse, Philippe; Pinson, Jean; Henderson, Luke C.

    Organizations: Australian Government via the Australian Research Council World Class Future Fiber Industry Transformation Research Hub [IH140100018]; ARC Training Centre for Lightweight Automotive Structures [IC160100032, DP180100094]; Office of Naval Research [N62909-18-1-2024]; ANR (Agence Nationale de la Recherche) through Labex SEAM (Science and Engineering for Advanced Materials and devices) [ANR-10-LABX-096, ANR-18-IDEX-00]; CGI (Commissariat a l'Investissement d'Avenir) through Labex SEAM (Science and Engineering for Advanced Materials and devices) [ANR-10-LABX-096, ANR-18-IDEX-00]

    Keywords: Aryldiazonium; Surface modification; Composite; Anthraquinone; Carbon fibers

    Carbon fibres with redox-active surface functionalities have shown potential applications in environmental remediation, and as burgeoning materials for structural batteries and super capacitors. In this work we describe the tethering of anthraquinone, capable of a reversible 2 electron transfer in aqueous medium, to the carbon fibre surface, and the corresponding effect on interfacial adhesion. The anthraquinone alone results in a >150% improvement in interfacial shear strength and the redox activity is preserved. Further to this, we then use this conductive film as a means to grow an acrylic acid polymer on top of the anthraquinone base layer, characterized by water contact angle, infrared spectroscopy, and depth-profiling X-ray photoelectron spectroscopy. This outermost layer imparts additional benefit to fibre-to-matrix adhesion and preserves the redox activity of the modified carbon fibers. This work demonstrates the ability to grow dual component and covalently-attached sizings to the carbon fiber surface, without compromising the inherent benefits of the underlying carbon fibers.
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