Impact Properties of the Chemically Treated Hemp Fibre Reinforced Polyester Composites
Vol. 21, No. 9, pp. 2098-2110,
Sep. 2020
10.1007/s12221-020-9630-4
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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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Cite this article
[IEEE Style]
M. M. Kabir, M. Y. Al-Haik, S. H. Aldajah, K. T. Lau, H. Wang, "Impact Properties of the Chemically Treated Hemp Fibre Reinforced Polyester Composites," Fibers and Polymers, vol. 21, no. 9, pp. 2098-2110, 2020. DOI: 10.1007/s12221-020-9630-4.
[ACM Style]
Mohammad Mazedul Kabir, Mohammad Yousef Al-Haik, Saud Hamad Aldajah, Kin Tak Lau, and Hao Wang. 2020. Impact Properties of the Chemically Treated Hemp Fibre Reinforced Polyester Composites. Fibers and Polymers, 21, 9, (2020), 2098-2110. DOI: 10.1007/s12221-020-9630-4.