Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Effect of Different Conditions of Sodium Chloride Treatment on the Characteristics of Kenaf Fiber-Epoxy Composite Board

  • SETYAYUNITA, Tamaryska (Department of Forest Product Technology, Faculty of Forestry, Universitas Gadjah Mada Jl) ;
  • WIDYORINI, Ragil (Department of Forest Product Technology, Faculty of Forestry, Universitas Gadjah Mada Jl) ;
  • MARSOEM, Sri Nugroho (Department of Forest Product Technology, Faculty of Forestry, Universitas Gadjah Mada Jl) ;
  • IRAWATI, Denny (Department of Forest Product Technology, Faculty of Forestry, Universitas Gadjah Mada Jl)
  • Received : 2021.11.18
  • Accepted : 2022.02.15
  • Published : 2022.03.25
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Abstract

Currently, biofibers are used as a reinforcement in polymer composites for structural elements and construction materials instead of the synthetic fibers which cause environmental problems and are expensive. One of the chemicals with a pH close to neutral that can be potentially used as a modified fiber material is sodium chloride (NaCl). Therefore, this study aims to investigate the characteristics of a composite board made from NaCl-treated kenaf fiber. A completely randomized design method was used with consideration of two factors: the content of NaCl in the treatment solution (1 wt%, 3 wt%, and 5 wt%) and the duration of immersion of fibers in the solution (1 h, 2 h, and 3 h). The NaCl treatment was conducted by soaking the fibers in the solution for different durations. The fibers were then rinsed with water until the pH of the water reached 7 and subsequently dried inside an oven at 80℃ for 6 h. Kenaf fiber and epoxy were mixed manually with the total loading of 20 wt% based on the dry weight of the fiber. Physical and mechanical properties of the fibers were then evaluated based on JIS A 5908 particleboard standards. The results showed that increasing NaCl content in the fiber treatment solution can increase the physical and mechanical properties of the composite board. The properties of fibers treated with 5 wt% NaCl for 3 h were superior with a modulus of elasticity of 2.085 GPa, modulus of rupture of 19.77 MPa, internal bonding of 1.8 MPa, thickness swelling of 3%, and water absorption of 10.9%. The contact angle of untreated kenaf fibers was 104°, which increased to 80° and 73° on treatment with 1 wt% and 5 wt% NaCl for 3 h, respectively.

Keywords

Acknowledgement

We appreciate the financial support of the PMDSU Program (2960/UN1.DITLIT/DIT-LIT/LT/2019) from the Ministry of Research, Technology, and Higher Education in this research.

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