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King Fahd University of Petroleum and Minerals. (KFUPM) 2022

Date Palm Midrib Fibers as an Ecofriendly Reinforcement in Composite Materials.

ALABDALI RAKAN

Titre : Date Palm Midrib Fibers as an Ecofriendly Reinforcement in Composite Materials.

Auteur : ALABDALI RAKAN

Université de soutenance : King Fahd University of Petroleum and Minerals. (KFUPM)

Grade : Master thesis 2022

Résumé
The goal of this work is to use date palm midrib fibers as an ecofriendly substitution for synthetic fibers in composite materials and to make it competitive with the commercial wood products. Natural cellulosic fibers, such as date palm fibers, have mechanical properties comparable to synthetic fibers. Saudi Arabia is one world’s leading producers of dates and thus has an exorbitant number of date palms trees whose crop residue goes largely unused. Date palms have an annual pruning process which produce about 300,000 tons/year of agricultural residue that can be used to make value-added products. Date palms’ midrib core is the raw material for this work because it is one of the most available by-products, available throughout the year, and has a dense packing of fibers. The fiber-extraction process entails boiling the midribs with water to soften the lignin, followed by hammering the midribs to separate the fibers from the lignin, and then drying the isolated fibers. The matrix portion of the composite in this work is an epoxy resin. After reinforcing the matrix with the date palms midrib fibers, samples were mechanically tested to compare mechanical properties of this methodology with prior literature establishing the significance of this methodology. For the composite, the average modulus of elasticity is in the range of 3 GPa which is the requirement for the majority of the commercial wood products. A maximum value of 9 GPa was reached for the elastic modulus. This demonstrates the potential of this extraction technique and processing route that can be achieved with improvements suggested in the future work section. The tensile strength reached as high as 40 MPa and average value of 27 MPa which also meets commercial products requirements. Tests were also performed on single fibers in order to understand their properties for modeling purposes. For single fibers, the average tensile strength and modulus of elasticity values are 333 MPa and 17 GPa, respectively. Finally, single fiber pull-out test was performed to determine the interfacial shear strength between the fibers and matrix necessary for modeling the composite material. The interfacial strength ranged between 6 – 12 MPa. Results from this effort are compared to the literature and currently available commercial products and are found to have a promising outlook.

Présentation

Page publiée le 18 janvier 2023