The effects of lignin on mechanical, biodegradability, morphology, and thermal properties of PP/PLA/lignin were investigated. PP/PLA/lignin film were manufactured by adding PP, PLA, lignin and compatibilizer into rheomix at 200°C, at 70 rev min −1 for 30 minthen pressed using Hydraulic Hot Press at 200°C-210°C, at 6 bar for 20 min. The functional groups of PP/ PLA/lignin were analyzed using FTIR. The surface morphology, mechanical properties and thermal stability was measured by SEM, tensile strenght and TGA respectively. TThe FTIR intensity of vibration peak of -CH 3 cm -1 from PP/lignin and PP/PLA/lignin at 997-993, 1458-1451 and 2966-2904 cm -1 was lower than neat PP. The addition of lignin into PP/lignin, PLA/ lignin and PP/PLA/lignin can reduce tensile strength and elongation at break. The thermal stability PP/PLA/lignin was lower than the PP/lignin but higher compared to PP/PLA biocomposites. The biodegradability of PP/PLA/lignin biocomposites was two times higher than that of PP/lignin.
This study aimed to investigate the properties of edible films derived from the biocomposites of starch nanoparticles (SNPs) and chitosan. Chitosan was prepared in concentrations of 1.5, 2.0 and 3.0 wt%. The SNPs and film properties were investigated. The functional group of SNPs and chitosan as the edible film was evaluated. Then, the morphological structure, mechanical properties, thermal behavior and contact angles of the obtained films were also investigated. The data were subjected to a general linear model, and analysis of variance was carried out by using the SPSS version 23 software. The results from the research demonstrated that the solubility in water and the degree of swelling increased after the utilization of SNPs. Additionally, there was less tensile strength and higher elongation after the use of SNPs. Scanning electron microscopy analysis exhibited a smoother surface, and there was no formation of cracks when the starch transformed into nanoparticles. However, the addition of chitosan in SNPGC resulted in a grainy structure with irregularity on the surface of the films. Chitosan enhanced the degree of contact angles to 70.65 ± 2.90°, indicating an increase in the hydrophobicity of the films. This research suggested that the biocomposite films derived from SNPs–chitosan showed better performance.
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