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PEER-REVIEWED ARTICLE
Fig. 5. Effect of press temperatures on the flexural properties of biocomposites Effect of Particle Size on Flexural Properties The size of wood particles plays an important role in the fabrication and overall characteristics of engineered wood (Korosten MDF manufacture 2013; Lias HWDO . 2014). Particleboard usually consists of large wood particles obtained from inexpensive wood sources, which are hot-pressed with a petroleum based binding agent ( LH formaldehyde resins) (Korosten MDF manufacture 2013). MDF in contrast is made of finer wood particles and typically are much denser and thinner than particleboard. MDF may be glued together with lignin and wax (paraffin), and these are therefore more eco-friendly than particleboard (Korosten MDF manufacture 2013; Lias HWDO . 2014). In this study a variety of wood particles were employed in the DDGS-PW composites ( )LJ 6). It was found that the bending strength ( ) P ) and modulus of elasticity ( ( P ) values of DDGS-PW composites were influenced by the particle size of the wood employed. For example, composites composed of the largest wood particles (600 to 1700 P m) had the lowest flexural values when compared to the other composites tested, ) P and ( P values were 34.2 r 1.4 and 5151 r 244, respectively. The composite that contained 425 to 600 P m particles selection also exhibited lower flexural properties. Composites containing 180 to 250 um particles had the highest ) P and ( P values that were 45.4 r 2.3 and 7409 r 276, respectively. This suggested that this particle size was optimum for producing high quality composites. Composites that contained a mixture of wood particles composed of < 1700 P m or < 600 P m exhibited higher flexural properties that rivaled the 180 to 250 P m composite. Interestingly, composites containing the smallest particle (< 74 P m) exhibited lower ) P values but had ( P values in par with the other composites. Other researchers have noted the importance of wood particle size on the mechanical properties using thermoplastic resin-wood blends (Stark and Berger 1997; Tisserat HWDO . 2013b).
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Tisserat et al . (2018). “DDGS - PW fiberboards” B io R esources 13(2), 2678-2701.
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