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

Tan, Chao; Rudd, Chris D.; Parsons, Andrew J.; Sharmin, Nusrat; Ahmed, Ifty


Chao Tan

Chris D. Rudd

Nusrat Sharmin


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 fragmentation 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.


Tan, C., Rudd, C. D., Parsons, A. J., Sharmin, N., & Ahmed, I. (2022). L-DOPA coating improved phosphate glass fibre strength and fibre/matrix interface. Journal of the Mechanical Behavior of Biomedical Materials, 136, Article 105480.

Journal Article Type Article
Acceptance Date Sep 18, 2022
Online Publication Date Sep 29, 2022
Publication Date Dec 1, 2022
Deposit Date Sep 30, 2022
Publicly Available Date Sep 30, 2023
Journal Journal of the Mechanical Behavior of Biomedical Materials
Print ISSN 1751-6161
Electronic ISSN 1878-0180
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 136
Article Number 105480
Keywords Mechanics of Materials; Biomedical Engineering; Biomaterials
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