Effects of wood flour on the mechanical, thermal and morphological properties of poly (L-lactic acid)-chitosan biopolymer composites

Abstract

The aim of this paper was to investigate the effects of wood flour on the mechanical, morphological and thermal properties of poly (L-lactic acid) (PLA)-chitosan biopolymer composites produced by compression molding. The composites were characterized by a combination of mechanical properties, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The addition of chitosan to PLA matrix reduced the tensile strength from 57,1 MPa for pure PLA to 34,3 MPa for 5% chitosan and 11,5 MPa for 10% chitosan, and the flexure strength from 72,3 MPa for pure PLLA to 30,4 MPa for 5% chitosan and 24,6 MPa for 10% chitosan. The change trend in the young's modulus was found to be similar as compare with the tensile strength. However, the flexure modulus generally increased with the addition of the chitosan as comparison with pure PLA. The mechanical properties of the PLA-chitosan blends with wood flour were found to be lower than theirs of the pure PLA. According to SEM images, some holes and small voids at various diameters on the fractured section of the all composites were seen. T onset , T 10% , T 50% , T 85% of the pure PLA decreased with the addition of both chitosan and wood flour. Thermal stability of the PLA-chitosan blends was determined to be better than the PLA-chitosan composites with wood flour.

Characterization of PLA/PCL/Green Mussel Shells Hydroxyapatite (HA) Biocomposites Prepared by Chemical Blending Methods

“…The findings of this research show that the biocomposite material’s flexural strength fulfills the standards for cortical bone, which are 50–150 MPa [ 24 ]. Additionally, this research created a biocomposite material with a flexural modulus that met the requirements for the cortical bone’s flexural modulus, which is 0.6–2.69 GPa [ 55 ]. Additionally, the biocomposite created in this work has a higher flexural modulus than cancellous bone, which has a flexural modulus of 0.05–0.5 GPa [ 24 ].…”

Effects of microcrystalline cellulose on some performance properties of chitosan aerogels

“…They reported that chitosan/cellulose membranes can be used for wound dressing as it has the potential to prevent wound based on antimicrobial capability against Escherichia coli and Staphylococcus aureus. Altuntas and Aydemir (2019) investigated effect of wood flour on the performance properties of poly (L-lactic acid)-chitosan biopolymer composites. They reported that wood flour improved all the mechanical and thermal properties of PLA-chitosan.…”

Crystallinity and impact strength improvement of wood-polylactic acid biocomposites produced by rotational and compression molding

“…The better morphology of CM samples was related to the high pressure applied during processing. This pressure allows higher material compaction producing fewer voids and better wood particles wettability, which, as discussed in the following paragraphs, gave higher density values (Altuntas andAydemir 2019, Cisneros-López et al 2018). The density of the wood particles and the biocomposites are presented in Table 1.…”

“…The use of biodegradable polymers has significantly increased over the last years, especially the polylactic acid (PLA) due to its good properties such as high mechanical strength, easy processability, and a wide range of available commercial grades (González-López et al 2018, Altuntas andAydemir 2019). PLA is a semi-crystalline aliphatic polyester with applications in the agricultural, biomedical, and packaging industries (Kim et al 2007).…”