The Influence of Alkaline Treatment of Recycled Natural Materials on the Properties of Epoxy Resin Composites

Main Article Content

Hamza M. Kamal Mohammed J. Kadhim Raeid K. Mohammed


Natural fibers and particles reinforced composites are being broadly used due to their bio and specific properties such as low density and easy to machine and production with low cost. In this work, water absorption and mechanical properties such as tensile strength, flexural strength and impact strength of recycled jute fibers reinforced epoxy resin were enhanced by treating these fibers with alkaline solution. The recycled jute fibers were treated with different concentration of (NaOH) solution at (25 0C) for a period of (24) hours. From the obtained results, it was found that all these properties are improved when fibers treated with (7.5wt% NaOH) related to untreated fibers. Conversely, the mentioned properties of composites decreased after fibers treated with (10wt% NaOH). In addition, the hybrid composite with recycled jute fibers and recycled walnut shell powder showed obvious enhancement in the above-mentioned properties.

Article Details

How to Cite
KAMAL, Hamza M.; KADHIM, Mohammed J.; MOHAMMED, Raeid K.. The Influence of Alkaline Treatment of Recycled Natural Materials on the Properties of Epoxy Resin Composites. Al-Khwarizmi Engineering Journal, [S.l.], v. 14, n. 4, p. 45-53, dec. 2018. ISSN 2312-0789. Available at: <>. Date accessed: 12 dec. 2018. doi:


[1] Muhammad Jannah Bin Jusoh, "Studies on the properties of woven natural fibers reinforced unsaturated polyester composites", MSc thesis, 2008.
[2] Basu,G., Samanta, A.K., Ghosh, P, "Enzyme and silicone treatments on jute fiber" ,Part II. Effect on process performance during yarn making and yarn properties. Text.Inst 99, 307–316, 2008.
[3] A.V. Ratna Prasad, K. Mohana, "Mechanical properties of natural fibre reinforced polyester composites: Jowar, sisal and bamboo", Materials and Design 32 (2011) 4658-4663.
[4] Allan C. Manalo, Evans Wani, Noor Azwa Zukarnain, Warna Karunasena "Effects of alkali treatment and elevated temperature on the mechanical properties of bamboo fiber polyester composites", Composites Part B 80, (2015) 73e83.
[5] Libo Yan, Nawawi Chouw, Liang Huang, Bohumil Kasal," Effect of alkali treatment on microstructure and mechanical properties of coir fibers, coir fiber reinforced polymer composites and reinforced cementitious composites", Construction and Building Materials, 112 (2016) 168–182.
[6] Grain M. Munakaampe, Shamitiba B. Kanyanga, Peter Myler, Chizyuka G. Chizyuka,"Response of natural sisal reinforced polyester composites to three-point and four-point bending", Procedia Manufacturing, Vol. 7, (2017), 327-332.
[7] Easwara Prasad G L, Keerthi Gowda B S, Velmurugan R, "Comparative study of impact strength characteristics of the treated and untreated sisal polyester composite", Procedia Engineering 173 ( 2017 ) 778 – 785.
[8] Sanjay M R, Arpitha G R, B Yogesha, "Study on mechanical properties of natural glass fiber reinforced polymer hybrid composites: A review", Materials Today: Proceedings 2 (2015) 2959 – 2967.
[9] D. Bazrgari, F. Moztarzadeh, A.A. Sabbagh-Alvani, "Mechanical properties and tribological performance of epoxy/Al2O3 nanocomposite", Ceramics International, 2017.
[10] M.Ozgur Seydibeyoglu, Amar K. Mohanty, Manjusri Misra, "Fiber technology for fiber-reinforced composites", Woodhead Publishing is an imprint of Elsevier, 2017.
[11] N. Chand and M. Fahim, "Tribology of natural fiber polymer composites", Woodhead Publishing Series in Composites Science and Engineering, 2008.
[12] D3039/D3039M, "Standard test method for tensile properties of polymer matrix composite materials", American Society for Testing and Materials, Volume 15.03, 2015.
[13] D256 – 10, "Standard test methods for determining the Izod pendulum impact resistance of plastics", American Society for Testing and Materials, Volume 08.01, 2015.
[14] D790 – 10, "Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials", American Society for Testing and Materials, Volume 08.01, 2015.