Brewing sustainability and strength: biocomposite development through tea waste incorporation in polylactic acid

Hatkeposhti, JK, Kordani, N, Pasha, MA and Bodaghi, M ORCID: https://orcid.org/0000-0002-0707-944X, 2023. Brewing sustainability and strength: biocomposite development through tea waste incorporation in polylactic acid. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. ISSN 1464-4207

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Abstract

This study aims to enhance the mechanical properties of polylactic acid by incorporating black tea waste as an economical and sustainable additive capable of being recycled. The black tea waste, after the hot water color removal process, is milled to a fine and uniform powder size. The combination of these particles with polylactic acid is carried out using a twin-screw extruder. Specimens of pure polylactic acid and biocomposites containing 3 and 5 wt% black tea waste are manufactured using a hot press machine at a temperature of 200 °C. The filaments are also successfully extruded for three-dimensional printing purposes. Scanning electron microscopy images reveal that in the polylactic acid-3% tea biocomposite, the tea particles are appropriately dispersed within the polylactic acid matrix. The tensile test results indicate that biocomposite polylactic acid-3% tea has the highest mechanical properties, with a tensile strength of 67 MPa, demonstrating a 34% increase compared to polylactic acid. Furthermore, the biocomposite of polylactic acid-3% tea waste exhibits the best performance with a fracture energy of 2.5 kJ/m 2 in the impact test. Hence, polylactic acid-3% tea biocomposite can be recommended as a suitable sustainable substitute. Finally, numerical simulations are performed on biocomposites containing double keyhole notches. This analysis is conducted to observe the behavior of biocomposite models with double keyhole notch under mixed-mode loading. The critical fracture load of the models is calculated using the strain energy density criterion. It is observed that an increase in the notch inclination angle and notch radius leads to a decrease in the fracture load in the models.

Item Type:	Journal article
Publication Title:	Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Creators:	Hatkeposhti, J.K., Kordani, N., Pasha, M.A. and Bodaghi, M.
Publisher:	Sage
Date:	19 December 2023
ISSN:	1464-4207
Identifiers:	Number Type 10.1177/14644207231221244 DOI 1847605 Other
Rights:	© IMechE 2023. This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	20 Dec 2023 11:20
Last Modified:	20 Dec 2023 11:20
URI:	https://irep.ntu.ac.uk/id/eprint/50581

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