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Impact Properties of the Chemically Treated Hemp Fibre Reinforced Polyester Composites

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Abstract

Plant based hemp fibre properties were found to be highly influenced by changes in the amounts of cellulose, hemicellulose and lignin constituents within the fibre. These fibre constituents play a major role for effective interfacial adhesion between the fibre and the matrix. Chemical treatments such as alkali (NaOH), acetyl (acetic acid & acetic anhydride) and silane (siloxane) treatments have the potential to react with constituent contents by varying their amounts. In this study, hemp fibre was treated with alkali (0–10 % NaOH), acetyl and silane chemicals. Treated fibres were mixed with polyester matrix to produce composites. The effects of chemical treatments on hemp fibres and the resulted polyester matrix composite were analysed through impact testing of the composite samples. Alkali treatments on hemp fibres enhanced the impact resistance properties (around 43 % lower absorbed energy and 40 % higher rebounded energy) of its composites compared to the untreated cases. Lower absorption energy and higher rebounded energy indicates strong interfacial bonding between the fibre and matrix. Improvements are governed by the removal of hemicellulose and lignin from the fibre, which provides a platform for better chemical reactions between fibres and matrix. On the other hand, acetyl treatments on the higher concentrations of NaOH pre-treated fibres reduced the fibres’ ability to support impact loadings (22 % higher rebounded energy compared to the untreated cases). In the two treatment conditions, fibre lessen their strength due to excessive removal of hemicellulose and lignin constituents, and composites exhibited lower impact properties compared to the NaOH treated samples. Similar impact properties were also recorded for alkali pre-treated silanised composites. As alkali pre-treatment removed the hydroxyl groups from the fibre, further silane treatment could not develop silanols to create strong interface bonding. As a result, composites failed under lower impact resistance compared to the NaOH treated samples.

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Acknowledgements

This project is supported by the Department of Education and Knowledge (ADEK), Abu Dhabi, United Arab Emirates and the University of Southern Queensland, Australia. The authors gratefully acknowledge to Dr. Mainul Islam, Ali Naim Khurshid and Wayne Crowell for providing helpful suggestions regarding this study.

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Authors and Affiliations

  1. Electro-Mechanical Engineering Department, Abu Dhabi Polytechnic, MBZ City, Abu Dhabi, 111499, UAE

    Mohammad Mazedul Kabir & Mohammad Yousef Al-Haik

  2. Higher College of Technology (HCT), Abu Dhabi, 127788, UAE

    Saud Hamad Aldajah

  3. Swinburne University of Technology, Melbourne, VIC, 3122, Australia

    Kin Tak Lau

  4. Centre for Future Materials, University of Southern Queensland, Springfield, QLD, 4300, Australia

    Hao Wang

Authors
  1. Mohammad Mazedul Kabir
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  2. Mohammad Yousef Al-Haik
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  3. Saud Hamad Aldajah
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  4. Kin Tak Lau
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  5. Hao Wang
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Correspondence to Mohammad Mazedul Kabir.

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Kabir, M.M., Al-Haik, M.Y., Aldajah, S.H. et al. Impact Properties of the Chemically Treated Hemp Fibre Reinforced Polyester Composites. Fibers Polym 21, 2098–2110 (2020). https://doi.org/10.1007/s12221-020-9630-4

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  • DOI: https://doi.org/10.1007/s12221-020-9630-4

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