Effects of chemical treatments on hemp fibre reinforced polyester composites

PhD Thesis


Kabir, Mohammad Mazedul. 2012. Effects of chemical treatments on hemp fibre reinforced polyester composites. PhD Thesis Doctor of Philosophy. University of Southern Queensland.
Title

Effects of chemical treatments on hemp fibre reinforced polyester composites

TypePhD Thesis
Authors
AuthorKabir, Mohammad Mazedul
SupervisorWang,Hao
Lau, Alan Kin-tak
Cardona, Francisco
Aravinthan, Thiru
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages232
Year2012
Abstract

Natural fibres have recently become an attractive alternative to synthetic fibres in the implementation in polymer composite structures. This is due to contemporary environmental concerns such as climate change which have caused engineers to consider renewable resources in composite structures. Inherent flaws within natural fibres in terms of their constituent contents (hemicellulose, cellulose and lignin) reduce the compatibility of these fibres with polymer matrices. Fibre surface modifications using chemical treatments have the potential to improve fibre-matrix compatibility.
In this study, the effects of chemical treatments on hemp fibres and the resulted polyester matrix composite are discussed. The fibres were treated with alkali (0-10% NaOH), acetyl and silane chemicals.
The structural composition and thermal decomposition of the fibres after treatments were investigated through chemical analysis, fibre morphology analysis, FTIR analysis, and TGA and DSC analyses. Fibre structure and morphology analysis showed that the amount of hemicellulose and lignin constituents decreased in the case of alkalised and acetylated fibres. Conversely, silane molecules formed couplings on fibre surfaces and there was no changes observed in terms of hemicellulose and lignin contents. Thermal analysis revealed that, due to the presence of hemicellulose constituents, the untreated fibres had lower thermal stability. The tensile properties of treated hemp fibres were measured through DMA. Treated fibres exhibited lower strengths compared to the untreated fibres due to the removal of hemicellulose and lignin binder from their cellulose surfaces.
Long unidirectional fibre composites and sandwich structures were tested using tension, compression, shear, bending and impact tests. In both composite cases, 4% NaOH treatments reduced interface bonding strength and decreased composite properties compared to untreated samples. At higher concentrations (6-10% NaOH), composite properties increased as a result of greater interface bonding. The opposite results were achieved in the case of alkalised fibres that were further treated with acetyl and silane treatments. Failure analysis of tested composites was undertaken through OM and SEM. Micrographs showed results which were in agreement which the properties achieved.
Treated fibres were able to effectively improve the bonding properties of composites, even though the mechanical strength of these fibres could be decreased. Thus, the use of chemical treatments on fibres can be justified as overall composite mechanical properties increased when compared to untreated cases.

Keywordshemp fibres; fibre-matrix compatibility; polyester matrix; thermal decomposition; structural composition; hemicellulose constituents; fibre
ANZSRC Field of Research 2020340305. Physical properties of materials
401602. Composite and hybrid materials
401605. Functional materials
Byline AffiliationsFaculty of Engineering and Surveying
Permalink -

https://research.usq.edu.au/item/q1y4v/effects-of-chemical-treatments-on-hemp-fibre-reinforced-polyester-composites

Download files


Published Version
Kabir_2012_whole.pdf
File access level: Anyone

  • 2163
    total views
  • 1140
    total downloads
  • 3
    views this month
  • 2
    downloads this month

Export as

Related outputs

Enhancement of the Mechanical and Thermal Properties of Polypropylene and Nylon 6.6 Composite Blends
Al-Haik, Mohammad Yousef, Aldajah, Saud Hamad, Kabir, Mohammad Mazedul, Siddique, Waseem Ahmad, Haik, Yousef and Islam, Md Mainul. 2023. "Enhancement of the Mechanical and Thermal Properties of Polypropylene and Nylon 6.6 Composite Blends." Advances in Materials Science and Engineering. 2023. https://doi.org/10.1155/2023/6535067
Impact Properties of the Chemically Treated Hemp Fibre Reinforced Polyester Composites
Kabir, Mohammad Mazedul, Al-Haik, Mohammad Yousef, Aldajah, Saud Hamad, Lau, Kin Tak and Wang, Hao. 2020. "Impact Properties of the Chemically Treated Hemp Fibre Reinforced Polyester Composites." Fibers and Polymers. 21 (9), pp. 2098-2110. https://doi.org/10.1007/s12221-020-9630-4
Effect of hemp fibre surface treatment on the fibre-matrix interface and the influence of cellulose, hemicellulose and lignin contents on composite strength properties
Kabir, Mohammad Mazedul, Alhaik, Mohammad Yousef, Aldajah, Saud Hamad, Lau, Kin Tak, Wang, Hao and Islam, Md Mainul. 2021. "Effect of hemp fibre surface treatment on the fibre-matrix interface and the influence of cellulose, hemicellulose and lignin contents on composite strength properties." Advances in Materials Science and Engineering. 2021, pp. 1-17. https://doi.org/10.1155/2021/9753779
Hemp reinforced composites with alkalization and acetylation fibre treatments
Wang, H., Kabir, M. M. and Lau, K. T.. 2014. "Hemp reinforced composites with alkalization and acetylation fibre treatments." Polymers and Polymer Composites. 22 (3), pp. 247-252. https://doi.org/10.1177/096739111402200
Mechanical and thermal properties of jute fibre reinforced composites
Kabir, Mohammad Mazedul, Islam, Md Mainul and Wang, Hao. 2013. "Mechanical and thermal properties of jute fibre reinforced composites." Journal of Multifunctional Composites. 1 (1), pp. 71-77. https://doi.org/10.12783/issn.2168-4286/1.1/Islam
Effects of chemical treatments on hemp fibre structure
Kabir, M. M., Wang, H., Lau, K. T. and Cardona, F.. 2013. "Effects of chemical treatments on hemp fibre structure." Applied Surface Science. 276, pp. 13-23. https://doi.org/10.1016/j.apsusc.2013.02.086
Tensile properties of chemically treated hemp fibres as reinforcement for composites
Kabir, M. M., Wang, H., Lau, K. T. and Cardona, F.. 2013. "Tensile properties of chemically treated hemp fibres as reinforcement for composites." Composites Part B: Engineering. 53, pp. 362-368. https://doi.org/10.1016/j.compositesb.2013.05.048
Compressive properties of chemically-treated hemp fibre reinforced composites
Kabir, Mohammad Mazedul, Wang, Hao, Lau, Alan, Cardona, Francisco and Aravinthan, Thiru. 2012. "Compressive properties of chemically-treated hemp fibre reinforced composites." Heslehurst, Rikard Benton and Byrne, Ann (ed.) Composites Australia and the CRC for Advanced Composite Structures Conference 2012: Diversity in Composites. Leura, Australia 15 - 16 Mar 2012 Melbourne, Australia.
Chemical treatments on plant-based natural fibre reinforced polymer composites: an overview
Kabir, M. M., Wang, H., Lau, K. T. and Cardona, F.. 2012. "Chemical treatments on plant-based natural fibre reinforced polymer composites: an overview ." Composites Part B: Engineering. 43 (7), pp. 2883-2892. https://doi.org/10.1016/j.compositesb.2012.04.053
Mechanical properties of chemically-treated hemp fibre reinforced sandwich composites
Kabir, M. M., Wang, H., Lau, K. T., Cardona, F. and Aravinthan, T.. 2012. "Mechanical properties of chemically-treated hemp fibre reinforced sandwich composites." Composites Part B: Engineering. 43 (2), pp. 159-169. https://doi.org/10.1016/j.compositesb.2011.06.003
The effect of fibre chemical treatments on hemp reinforced composites
Wang, H., Kabir, M. M. and Lau, K. T.. 2011. "The effect of fibre chemical treatments on hemp reinforced composites ." 18th International Conference on Composite Materials (ICCM-18). Jeju, Korea 21 - 26 Aug 2011 Seoul, Korea.
Effect of chemical treatment on the mechanical and thermal properties of hemp fibre reinforced thermoset sandwich composites
Kabir, M. M., Wang, H., Cardona, F. and Aravinthan, T.. 2011. "Effect of chemical treatment on the mechanical and thermal properties of hemp fibre reinforced thermoset sandwich composites." Fragomeni, Sam, Venkatesan, Srikanth, Lam, Nelson T. K. and Setunge, Sujeeva (ed.) 21st Australasian Conference on the Mechanics of Structures and Materials (ACMSM 21). Melbourne, Australia 07 - 10 Dec 2010 Leiden, Netherlands. https://doi.org/10.1201/b10571-78
Effects of natural fibre surface on composite properties: a review
Kabir, M. M., Wang, H., Aravinthan, T., Cardona, F. and Lau, K. -T.. 2011. "Effects of natural fibre surface on composite properties: a review." Cowled, Craig J. L. (ed.) 1st International Postgraduate Conference on Engineering, Designing and Developing the Built Environment for Sustainable Wellbeing (eddBE 2011). Brisbane, Australia 27 - 29 Apr 2011 Brisbane, Australia.
Mechanical and thermal properties of untreated and chemically treated jute fibre reinforced composites
Kabir, Mohammad Mazedul, Islam, Md Mainul and Wang, Hao. 2010. "Mechanical and thermal properties of untreated and chemically treated jute fibre reinforced composites." 1st International Conference on Mechanical, Industrial and Energy Engineering (ICMIEE 2010) . Khulna, Bangladesh 23 - 24 Dec 2010 Khulna, Bangladesh.
An overview on syntactic foam core and paper skin sandwich composites as potential building materials
Islam, Md Mainul, Kim, Ho Sung and Kabir, Mohammad Mazedul. 2010. "An overview on syntactic foam core and paper skin sandwich composites as potential building materials." 2010 International Conference on Mechanical, Industrial and Energy Engineering (ICMIEE2010). Khulna, Bangladesh 23 - 24 Dec 2010 Khulna, Bangladesh.