L-DOPA coating improved phosphate glass fibre strength and fibre/matrix interface

Tan, Chao, Rudd, Chris D., Parsons, Andrew J., Sharmin, Nusrat, and Ahmed, Ifty (2022) L-DOPA coating improved phosphate glass fibre strength and fibre/matrix interface. Journal of The Mechanical Behavior of Biomedical Materials, 136. 105480.

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The levodopa (L-DOPA) has been reported as a promising adhesive for various materials. In this study, we utilized L-DOPA as an interfacial agent for phosphate glass fibre/polycaprolactone (PGF/PCL) composites, with the aim to enhance the interfacial properties between the fibres and polymer matrix. The PGFs were dip-coated in varying concentrations of L-DOPA solution ranging between 5 and 40 g L-1. The fibre strength and interfacial shear strength (IFSS) of the composites were measured via a single fibre tensile test and single fibre fragmen-tation test, respectively. It was found that the L-DOPA agent (at conc. 10 g L-1) significantly improved the IFSS of the composites up to 27%. Also, the L-DOPA coating (at conc. 40 g L-1) significantly increased the glass fibre strength up to 18%. As a result, an optimum coating level could be tailored depending on application and whether fibre strength or IFSS was of greater importance. In addition, SEM and TGA analyses were used to detect and quantify the coating agents. FTIR and XPS further confirmed presence of the coating and indicated the zwitterionic crystals of L-DOPA and the formation of a melanin-like polymer layer. The spectroscopy data also evidenced that both catechol and amine groups contributed to the interaction between the L-DOPA and the PGF surface.

Item ID: 76900
Item Type: Article (Research - C1)
ISSN: 1751-6161
Keywords: L-DOPA, Coating, Phosphate glass fibre, Fibre, matrix interface, Fibre strength
Copyright Information: © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Date Deposited: 30 Nov 2022 08:54
FoR Codes: 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials @ 100%
SEO Codes: 24 MANUFACTURING > 2415 Transport equipment > 241501 Aerospace equipment @ 100%
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