Surface properties of novel wood-based reinforced composites manufactured from crushed veneers and phenolic resins

Huang, Yuxiang; Qi, Yue; Zhang, Yamei; Zhu, Rixiang; Zhang, Yahui; Yu, Wenji

doi:10.4067/s0718-221x2019005000206

Cited by 7 publications

(9 citation statements)

References 26 publications

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“…Fluffed bamboo [1,8] and wood [2,5] veneers were prepared according to the methods detailed in previously published literature. Specifically, the Neosinocalamus affinis bamboo culm was processed into two 2000 mm long semicircular bamboo bundles by transverse truncation and longitudinal splitting.…”

Section: Preparation Of Bamboo and Wood Fluffed Veneersmentioning

confidence: 99%

“…Furthermore, compared with a traditional poplar WLC fabricated using veneers without fluffing, a novel WLC constructed using fluffed veneers exhibited a slight decline in mechanical strength but significantly improved dimensional stability [4]. Additionally, denser WLCs have been observed to exhibited improvements in mechanical properties, dimensional stability, and surface properties [2,4,5]. Finally, the veneer thickness, mat formation, and resin solid content have also been found to have an important impact on the physical and mechanical properties of WLCs [6].…”

Section: Introductionmentioning

confidence: 96%

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Engineered Wood/Bamboo Laminated Composites for Outdoor Hydrophilic Platforms: Structural Design and Performance

Ji¹,

Zhang²,

Rao³

2022

Journal of Renewable Materials

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Landscape designers increasingly prefer to use wood/bamboo-based composites for outdoor hydrophilic platforms owing to their natural surface texture, high performance, and sustainability to facilitate extensive interaction between people and water and enable the full range of ecological functions of water resources. In this study, four laminated composite (LC) structures were designed and manufactured using fluffed bamboo and wood veneers. Their surface textures, profile densities, water resistances, and mechanical properties were then evaluated. The type of fluffed veneer of the surface layer determined the texture of the LC surface. The specific structures of fluffed bamboo and wood veneer laminations were found to affect the LC profile density variability, water resistance, and mechanical properties owing to the differences in the strength and interfacial properties of bamboo and wood fibers. Finally, the water resistance and mechanical properties of all four LCs were found to be much higher than the highest level specified in GB/T 20241-2006 for ''laminated veneer lumber'' and GB/T 30364-2013 for "bamboo scrimber flooring", indicating that they are promising materials for structures and flooring, particularly for outdoor hydrophilic platforms.

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Section: Preparation Of Bamboo and Wood Fluffed Veneersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Engineered Wood/Bamboo Laminated Composites for Outdoor Hydrophilic Platforms: Structural Design and Performance

Ji¹,

Zhang²,

Rao³

2022

Journal of Renewable Materials

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“…Furthermore, it can be said that the increase in the contact angle values of the impregnated specimens is due to the decrease in the roughness values of these specimens and the hydrophobic (water repellent) nature of the impregnation materials used. Huang et al (2019) reported that the density increase in poplar veneers laminated after impregnation with phenolic resins has a reducing effect on the surface roughness and there is also a negative correlation between contact angle and surface roughness. Poplar wood treated with monomers synthesized from styrene and methyl methacrylate has a higher contact angle than untreated poplar (Li et al 2013).…”

Section: Fig 2 Roughness Values Of Impregnated and Densified Wood Spe...mentioning

confidence: 99%

“…The roughness or wettability characteristics of wood surfaces are separately affected by many factors, such as the wood anatomical properties, density, moisture, compression parameters, and properties of the machining process (Kılıç et al 2006;Diouf et al 2011;Ünsal et al 2011;Arruda and Del Menezzi 2013;Sofuoǧlu and Kurtoğlu 2015;Bekhta and Krystofiak 2016;Bekhta et al 2017;İlçe 2018;Pinkowski et al 2018). In addition, surface roughness significantly affects the equilibrium and nonequilibrium contact angles of solid materials (Shupe et al 2001;Büyüksarı et al 2011;Akgül et al 2012;Papp and Csiha 2017;Huang et al 2019;Luo et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Roughness, wettability, and morphological properties of impregnated and densified wood materials

Pelit

Arısüt

2022

BioRes

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The effects of pre-impregnation on surface roughness, wettability, and morphological structure of densified aspen and fir wood were investigated. Wood specimens were impregnated with paraffin, linseed oil, and styrene after pre-vacuum treatment. The impregnated specimens were densified using compression ratios of 20% and 40% at 120 °C, 150 °C, and 180 °C. The roughness decreased and the contact angle increased in all impregnated specimens (undensified and densified). Compared to paraffin and linseed oil-impregnated specimens, lower roughness and higher contact angle were found in styrene-impregnated specimens. After densification, the roughness and wettability of the wood specimens decreased. More successful results (lower roughness and higher contact angle) were generally obtained in specimens densified with high compression ratio (40%). In both untreated and impregnated specimens, the contact angle increased with increasing compression temperature. While the effect of compression temperature on the roughness of the fir specimens was not significant, the roughness of the aspen specimens (especially styrene-impregnated) decreased with the increase in temperature. Scanning electron microscopy observations indicated that impregnation agents (especially styrene) clung to wood cell walls and partially or completely filled the lumens. This was positively correlated with the determined roughness and wettability. Pre-impregnation facilitated wood densification without significant cell deformations.

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“…Surface roughness has a great influence on contact angle values. Surface roughness causes a hydrophilic surface to be more hydrophilic, and a hydrophobic surface to be more hydrophobic [19,20]. The surface of natural wood, for example, is hydrophilic, and high surface roughness creates a more hydrophilic surface [21].…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Pine Scrimber Panels with Varying Density

et al. 2019

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Coating quality for scrimber products against exterior conditions is largely dependent on the surface properties. The wettability, morphology, and chemical composition of pine scrimber surfaces were investigated to better understand the surface properties. The scrimber was found to be a hydrophilic material because the water contact angles were less than 90°. The panels with a density of 1.20 g/cm3 had the largest angle change rate (k = 0.212). As the panel density increased, the instantaneous contact angle of each test liquid (i.e., water, formamide, and diiodomethane) on the panels decreased, and so did surface free energy. Panels with higher density showed lower surface roughness. Surface roughness across the wood grain was greater than that along the grain. SEM observations showed the high-density panels had a smoother surface with fewer irregular grooves in comparison with the low-density panels. X-ray photoelectron spectroscopy (XPS) analysis indicated that more unoxygenated groups appeared on the surface of high-density panels.

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Surface properties of novel wood-based reinforced composites manufactured from crushed veneers and phenolic resins

Cited by 7 publications

References 26 publications

Engineered Wood/Bamboo Laminated Composites for Outdoor Hydrophilic Platforms: Structural Design and Performance

Engineered Wood/Bamboo Laminated Composites for Outdoor Hydrophilic Platforms: Structural Design and Performance

Roughness, wettability, and morphological properties of impregnated and densified wood materials

Surface Properties of Pine Scrimber Panels with Varying Density

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