Effect of thermal treatment on the physical and mechanical properties of phyllostachys pubescen bamboo

The feasibility of heat treatment of Masson pine veneers (MPVs) was evaluated based on mass loss, tensile strength, bending strength, and water absorption of the heat-treated MPVs, and its application in plywood was explored. Fourier-transform infrared and X-ray diffraction results showed that heat-treated MPVs contained a lower amount of hydrophilic groups and had an increased crystallinity. The maximum tensile strength was 59.2 MPa when MPVs were heat-treated at 210 °C for 5.0 min. The corresponding mass loss, water absorption (384 h), and bending strength values were 1.72%, 105.44%, and 83.1 MPa, respectively. Plywood produced from heat-treated MPV (210 °C, 30 min) with the best fungal durability and the lowest shear strength (1.07 MPa) still met the requirements of the Chinese National Standard (GB/T 9846.3-2004, ≥0.80 MPa) for exterior plywood. These results indicate that products based on heat-treated MPV will have increased fungal durability.

Section: Mass Losssupporting

confidence: 91%

Section: Tensile Strengthmentioning

confidence: 99%

Preparation and Properties of Heat-treated Masson Pine (Pinus massoniana) Veneer

Chen¹,

Rao²,

He³

et al. 2015

“…The OBFRC was made from carbonized OBFMs and subsequently exposed to ultraviolet radiation. Hemicellulose, amorphous cellulose and lignin could be degraded by different degrees during the heat treatment and weathering, respectively (Esteves and Pereira 2009;Wang and Ren 2009;Zhang et al 2013;Yu et al 2015). The decrease in the hydrophilic components of the OBFRC resulted in an increase in the surface hydrophobicity.…”

Section: Wettabilitymentioning

confidence: 99%

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

Rao¹,

Chen²,

Li³

et al. 2017

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.

“…For example, bamboo-based fiber composites can be used for both outdoor and indoor flooring, wood plank road, container flooring, garden landscaping, wind turbine blades, concrete boards, horse stable boards, and furniture (Qin et al 2009;Yu 2011;Zhang et al 2011;Zhu et al 2011;Zhu and Yu 2012;2013b;Yu et al 2014). However, the application of composites in exterior environments has been greatly limited by their surface color.…”

Section: Introductionmentioning

confidence: 99%

Effects of Acid Dye on the Performance of Bamboo-based Fiber Composites

Hu¹,

Yu²

2014

The objective of this study was to investigate the influence of acid dye on color change, modulus of rupture, modulus of elasticity, shear strength (parallel loading), thickness swelling rate, and water absorption rate of bamboo-based fiber composites from Phyllostachys pubescens. Bamboo fiber veneers were treated with acid black via three procedures: dyed in water at 20 °C, dyed in water at 90 °C, and dyed in ethanol at 75 °C. The samples dyed in ethanol at 75 °C and those dyed in water at 90 °C had a higher exhaustion rate than those dyed in water at 20 °C. The color change of bamboo fiber veneers exhibited similar variation trends by the three methods. The dyeing procedure slightly reduced the modulus of rupture and modulus of elasticity of bamboo-based fiber composites. Compared with the samples dyed in water, the samples dyed in ethanol had reduced shear strength (parallel loading) and modulus of elasticity. The thickness swelling rate and water absorption rate of bamboo-based fiber composite samples were reduced by the dye treatment.