Physical, Mechanical and Antibacterial Properties of Biodegradable Bioplastics from Polylactic Acid and Corncob Fibers with Added Nano Titanium Dioxide
DOI:
https://doi.org/10.48048/tis.2023.6473Keywords:
Biodegradable, Bioplastics, Polylactic acid, Corncob fibers, Nano titanium dioxide, Mixing PLA and CF, AntibacterialAbstract
The objective of this research was to investigate the mechanical, physical and antibacterial activities and biodegradability properties of bioplastics from polylactic acid (PLA) and corncob fibers (CF). The bioplastics were prepared by mixing PLA and CF at different ratios (100:0, 90:10, 80:20, 70:30, 60:40 and 50:50 % w:w) in the internal mixer and molding was done by using the hot-compressing molding method. The results demonstrated the decrease in tensile strength and elongation at break with increased in CF. Young’s modulus was found to be highest in the 70 %PLA: 30 %CF bioplastic, however, it decreased when the CF was increased. The hardness and water absorption were dependent on CF concentration. SEM analysis revealed the well dispersion of CF in PLA matrix. PLA matrix and increasing of CF induced in CF agglomeration. To develop PLA/CE plastic for antibacterial food packaging application, its antibacterial activity was conducted. The antibacterial determination revealed that 70 %PLA: 30 %CF containing 2 % TiO2 bioplastic exhibited the highest inhibition against E. Coli, S. aureus and B. subtilis. The results obtained from this research indicate that the bioplastics prepared from polylactic acid and corncob fibers is biodegradable bioplastics and can be used as alternate synthetic plastics. The bioplastic with 2 %TiO2 added can be utilized potentially for expected antibacterial food packaging.
HIGHLIGHTS
- The bioplastics prepared from polylactic acid and corncob fibers (PLA/CF) is a biodegradable bioplastic
- PLA/CF bioplastic with the addition of 1 % TiO2 possesses antibacterial property
- Corncob fibers decrease tensile strength, elongation at break and Young’s modulus of the PLA/CF bioplastic
- Corncob fibers increase the hardness and water absorption of the PLA/CF bioplastic
- Increasing concentration of corncob fibers causes the agglomeration of corncob fibers in the PLA/CF bioplastic
GRAPHICAL ABSTRACT
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