IMPACT OF WOOD PARTICLE TRAITS ON WOOD POLYMER COMPOSITE PROPERTIES

This study explores the impact of wood particles on the characteristics of wood polymer composites (WPCs) and their potential application in the construction sector. Through the employment of compression moulding, pristine low density polyethylene (acting as the matrix) was combined with sawdust from various wood types (Akpontu, Madobia, and Melina) to serve as fillers. Sodium hydroxide was employed as a binder during the composite formation process. Analysis of the manufactured test specimens revealed that softwoods exhibited superior mechanical strengths compared to hardwoods. Among the hardwoods, the optimal composition for wood particle reinforcement was determined to be 40%. With respect to Madobia wood, an increase in particle concentration enhanced composite strength and stiffness while diminishing the energy required for fracture. Correspondingly, the study demonstrated that water absorption escalated with augmented filler content, corroborating previous research findings. Notably, the research indicated that the initial hours witnessed a rapid uptake of water by WPCs. Specifically, Akpontu wood at 50 wt% exhibited the slowest water absorption rate within the initial 96 hours, while 30 wt% reached saturation point and ceased water absorption during the same timeframe. Furthermore, WPCs reinforced with 40 wt% wood displayed the highest overall water absorption rate. Scanning electron microscopy (SEM) was employed to investigate the interfacial interactions between composite components, providing valuable insights into the composite structure.

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