Abstract
This paper aimed at maximizing the application of oil palm empty fruit bunch (EFB) fibers to reinforce the starch-based bioplastics with superior mechanical and water resistance properties. EFB fibers were thermally modified with dry method by incorporating different concentrations of sodium hydroxide (NaOH). Thermal treatments with NaOH exceeding 10 wt% caused significant fiber loss. Fourier transform infrared spectroscopy (FTIR) exhibited the part removal of fatty acid, hemicellulose, and lignin and SEM observed clean surfaces for the treated fibers. The crystallinity index of the fibers increased from 13.82% to 97.60%, but their thermal stability decreased due to the treatments. The influence of treated fibers on the structure and properties of starch-based bioplastics was characterized. EFB fibers treated with 10 wt% NaOH attained the high yield of 52.44% and demonstrated the best reinforcing effects on the bioplastics. This was confirmed by higher thermal stability, tensile strength, and water resistance compared to the other starch-based bioplastics.
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