Effect of bark flour on the mechanical properties of HDPE composites

Abstract

The objective of this study was to evaluate the replacement of wood flour by Turkish pine bark residues for production of wood plastic composites. High density polyethylene was chosen as matrix and seven different compositions were used for production of composites. In order to compare the effect of bark residues flour as a filler, bark residues-HDPE composites were produced with various wt% bark residues loading (10, 20, 30 and 40 wt%). Bark residues filled HDPE pellets were produced by using a twin-screw extruder, then 25 cm (l) x 25 cm (w) and 2 mm (t) composites were produced with compression molding technique according to ASTM D4703-10. For each composition, three composites were produced. Tensile and flexural tests were performed with a Universal Testing machine. Impact strength was measured with a Zwick HIT5.5P Impact Testing machine. Tensile and impact strength of the composites decreased with increasing bark flour loading whereas bending strength and modulus of eleasticity values were improved with addition of the bark flour. All produced bark flour filled composites showed better modulus of elasticity and bending strength properties than ASTM D6662-13 standard requirements for polyolefinbased plastic lumber. Morphological properties of bark residues-HDPE composites were characterized by scanning electron microscopy (SEM) technique.

Selected properties of mahogany wood flour filled polypropylene composites: The effect of maleic anhydride-grafted polypropylene (MAPP)

“…Polymers used are either in virgin or recycled form. Currently, the main applications of WPC products are cladding, decking, fencing, paneling, and furniture (Çetin et al 2014;Özmen et al 2014;Çavuş and Mengeloğlu 2016;Martikka and Karki 2019;Mengeloğlu and Çavuş 2019). Good adhesion of matrix with WF improves the mechanical properties of WPCs.…”

Functionality of Beech Bark in Adhesive Mixtures Used in Plywood and Its Effect on the Stability Associated with Material Systems

“…Pedieu et al [32] showed that 70% of wood fibers in the core layer of particleboard could be replaced by white birch inner bark while maintaining the required mechanical and physical properties. Another study by Cetin et al [33] showed that bark in the core layer significantly lowered the formaldehyde emissions of the particleboard. The positive effect of amount of bark used to replace technical flour was observed only in the case of specific concentrations.…”

Influence of a bark-filler on the properties of PLA biocomposites

“…An opposite effect was obtained for HDPE matrix composites which showed significantly higher values for small particle. These results are borne out by two other studies: Yemele et al and Ç etina et al [18,38].…”