Effect of density on the hygroscopicity and surface characteristics of hybrid poplar compreg

Bao, Minzhen; Huang, Xianai; Zhang, Yahui; Yu, Wenji; Yu, Yanglun

doi:10.1007/s10086-016-1573-4

Cited by 52 publications

(27 citation statements)

References 37 publications

(46 reference statements)

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“…The higher the density and resin content of the samples, the higher the contact angles of the three liquids. This result indicated a lower wettability and was in agreement with previous studies [18]. Therefore, it can be established that the density of the samples had a significant effect on their wettability.…”

Section: Surface Wettabilitysupporting

confidence: 93%

A Note on the Surface Deterioration of Scrimber Composites Exposed to Artificial Ageing

Bao

Rao

et al. 2019

Coatings

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The effect of ultraviolet radiation on the surface deterioration of scrimber composites with different densities and levels of resin content was investigated for this paper. The surface color, gloss, roughness, and wettability of the samples were investigated to determine the extent of surface changes due to accelerated ageing. The results indicated that all scrimber composites exhibited variation in the color of their surfaces during artificial xenon light exposure. After artificial accelerated ageing, the surface contact angle and roughness were found to increase, whereas the surface gloss and surface free energy decreased. Furthermore, it was observed that the density and resin content of the scrimber composites contributed to reductions in their color variation, wettability, and roughness during weathering, which suggested that the density and resin content played important roles in determining their surface photodegradation properties. Artificial ageing resulted in the degradation of lignin and hemicellulose, thus causing severe surface characteristics.

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Section: Surface Wettabilitysupporting

confidence: 93%

A Note on the Surface Deterioration of Scrimber Composites Exposed to Artificial Ageing

Bao

Rao

et al. 2019

Coatings

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“…Figure 9 shows the dynamic CAs of the three different liquids as functions of time for the untreated OBFRC samples of different densities. A higher density resulted in a greater CA on the surfaces of the pristine OBFRC samples, which was true for all three liquids, and which is also the case with compregs (Bao et al 2016). After the weathering treatment, there were small differences in the CAs of water and formamide on the samples of different densities.…”

Section: Wettabilitymentioning

confidence: 54%

“…The density of composite materials has a significant effect on their wettability (Bao et al 2016). Table 4 The initial CAs for all the reference liquids at the same density level increased to different degrees after weathering, which suggests that the sample surface becomes more hydrophobic after weathering (Kalnins and Knaebe 1992).…”

Section: Wettabilitymentioning

confidence: 98%

“…In high-density composites with a compact internal structure, the pores are smaller and more dotted and/or linear cracks are blocked by adhesive (Yu et al 2014) because the water cannot easily penetrate the material. The thickness swelling rate (TSR) of wood/bamboo-based reconstituted composites makes the largest contribution to the VSE Zhu and Yu 2010;Bao et al 2016). The hot-pressing process and the compression springback of the composite together increase the TSR .…”

Section: Water Absorptionmentioning

confidence: 99%

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Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Rao¹,

Chen²,

Li³

et al. 2017

BioResources

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aOutdoor bamboo-fiber-reinforced composites (OBFRCs) with four different densities were prepared, and the microstructure and physicomechanical properties of pristine samples were evaluated. In addition, the surface color, glossiness, roughness, water absorption, and wettability of the samples were tested to investigate the effects of panel density on the extent of surface weathering due to ultraviolet radiation. The results showed that the OBFRCs exhibited excellent physical and mechanical properties, which improved with increasing density. However, increases in the density led to decreases in the hygroscopicity and dimensional stability of the OBFRCs. After weathering, the surface contact angle and surface roughness increased, and the dimensional stability improved. The surface glossiness, water absorption, and surface free energy decreased. A higher density resulted in improved color stability, which suggested that density played an important role in determining surface photodegradation properties. Thus, densityincreasing treatments had positive effects on the physical and mechanical properties as well as the color stability and wettability of the OBFRCs, but they may negatively affect the roughness and dimensional stability. Based on service-performance and cost-minimization considerations, 1.1 g/cm 3 was determined as the most appropriate density for general applications.

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“…Currently, the existing plantation forest in China of nearly 69 million ha area produces approximate 2.48 billion m 3 of growing stock. The plantation forest is equivalent to nearly 17% of the total forest for the whole country [1]. As one of the most important fast-growing tree species in China, the poplar wood becomes the overwhelming raw material to manufacture wood-based composite panels such as high-density particle board, high-density fiber board, compressed wood, and wood scrimber.…”

Section: Introductionmentioning

confidence: 99%

Study on the changes in surface characteristics of Populus tomentosa due to thermo-hydro-process

Bao

Jiang

et al. 2018

J Wood Sci

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The effects of high temperature, moisture, and mechanical action during the thermo-hydro-mechanical (THM) processing, on the changes in surface properties of poplar, namely, surface color, roughness, wettability, and microstructure, were investigated in this study. The correlation between observed changes in surface properties and chemical characteristics was also analyzed. Poplar woods with high moisture content were compressed using different pressures at temperature of 160 °C for four different periods. The wood surfaces became darker and smoother, and their surface free energy decreased significantly after the THM process. THM process markedly reduced surface hygroscopicity compared to the control wood. The cell lumens of THM wood became narrow with increasing compression ratio due to the enhancing high pressure. Collapse and fractures of cell walls developed during THM treatment. Furthermore, results indicated that a series of chemical reactions in different components of wood took place during THM process, such as degradation of hemicelluloses, condensation of lignin, and decomposition of extractives. In turn, these chemical modifications contributed to the darkening of color as well as the reduction of wettability and surface free energy of THM wood.

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Effect of density on the hygroscopicity and surface characteristics of hybrid poplar compreg

Cited by 52 publications

References 37 publications

A Note on the Surface Deterioration of Scrimber Composites Exposed to Artificial Ageing

A Note on the Surface Deterioration of Scrimber Composites Exposed to Artificial Ageing

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Study on the changes in surface characteristics of Populus tomentosa due to thermo-hydro-process

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