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Optimizing thealkalineconcentration forcoir fibre treatmentand estimation oflifetime L.G. ChamathL.K.T. SrimalGA Sewvandi2025 год

Optimizing the alkaline concentration for coir fibre treatment and estimation of lifetime
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Аннотация: Researchers are developing sustainable insulation composite materials using lignocellulose fibres, particularly coir fibres, which have low thermal conductivity, low density, high moisture resistance, and excellent thermal stability. However, these fibres naturally contain waxy, gummy, oily substances and impurities on their surfaces, necessitating a pre-treatment process to remove these contaminants before manufacturing. Alkaline treatment is an effective method for this pretreatment, however, selecting the appropriate concentration is critical. Furthermore, thermal decomposition of fibres may occur during composite manufacturing making it essential to assess fibre longevity. In this study, coir fibres were treated with NaOH solutions at concentrations of 0%, 2%, 4%, 6%, and 8%. The effects of alkaline treatment on surface roughness, chemical composition, and thermal stability were analyzed using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). The activation energy (Ea) for the thermal decomposition of lignocellulose substances was analyzed using the Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), and Friedman methods over a temperature range of 25 °C to 700 °C. The fibre lifetime was estimated using Toop’s equation. The results indicated that the 4% NaOH-treated sample exhibited superior surface roughness and thermal stability compared to other concentrations. The decomposition of lignocellulose substances began at a conversion rate of 0.2, with an Ea of 128.88 kJ/mol. The estimated fibre lifetime is approximately 6.55×106 hours at 25 °C. The lifetime of coir fibre decreases as temperature increases. Therefore, it is crucial to highlight the necessity of controlling the temperature during the fabrication of composites using coir fibers to prevent thermal degradation.
Год издания: 2025
Авторы: L.G. Chamath, L.K.T. Srimal, GA Sewvandi, Ruwan Gallage, J. Epaarachchi
Издательство: National Science Foundation
Источник: Journal of the National Science Foundation of Sri Lanka
Ключевые слова: Electrospun Nanofibers in Biomedical Applications, Textile materials and evaluations