Use impregnation and densification to improve mechanical properties and combustion performance of Chinese fir

Yue, Kong; Wu, Jianpeng; Xu, Liqin; Tang, Zhongqiu; Chen, Zhangjing; Liu, Weiqing; Wang, Lu

doi:10.1016/j.conbuildmat.2020.118101

Cited by 52 publications

(18 citation statements)

References 29 publications

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“…Wood is a green environmental protection material, and a natural and renewable resource. With the increasing consumption of wood, the global supply of natural forest wood is increasingly depleted, and it is imperative to enhance the efficient utilization of fast-growing plantation wood especially in China [ 1 ]. Compared with natural wood, plantation wood exhibits lower density and strength, so it is also more prone to fire risk [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Flame Retardant Properties and Thermal Decomposition Kinetics of Wood Treated with Boric Acid Modified Silica Sol

et al. 2020

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This paper presents experimental research on the flame-retardant properties and thermal decomposition kinetics of wood treated by boric-acid-modified silica sol. The poplar wood was impregnated with pure silica sol and boric-acid-modified silica sol. The results showed that modifiers can be observed in the cell wall and cell lumen. The ignition time, second peak of the heat release rate, total heat release, and mass loss of the W-Si/B were delayed obviously. The composite silicon modification had a positive impact on carbonization. Thermogravimetric analysis showed that the residual mass of W-Si/B was enhanced and the thermal degradation rate was considerably decreased. By thermal decomposition kinetics analysis, the boric acid can catalyze the thermal degradation and carbonization of poplar wood. In other words, wood treated with boric-acid-modified silica sol showed significant improvement in terms of flame retardancy, compared with wood treated with common silica sol.

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Section: Introductionmentioning

confidence: 99%

Flame Retardant Properties and Thermal Decomposition Kinetics of Wood Treated with Boric Acid Modified Silica Sol

et al. 2020

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“…However, China's limited natural forest resources cannot meet the demand of the forest product industry, and the imbalance of supply and demand leads to China's wood resources depending on imports [1]. Planted forests have a fast growth rate and high survival rate, and their development and planting can bring abundant wood resources to China's forest production industry [2].…”

Section: Introductionmentioning

confidence: 99%

Drying Characteristics of Eucalyptus urophylla × E. grandis with Supercritical CO2

et al. 2020

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Supercritical CO2 (ScCO2) is a drying medium with excellent solubility and mass transfer efficiency. Supercritical CO2 drying (SCD) can remove the water of wood rapidly and prevent a change of microstructure caused by capillary tension in the drying process. In this study, Eucalyptus urophylla × E. grandis specimens with lengths of 50 and 100 mm were dried with ScCO2. Conventional kiln drying (CKD) and oven-drying (OD) were used as control. After 1 h, the drying rate, shrinkage, moisture distribution, drying stress were measured to explore the influence of drying methods and specimen length for drying characteristics during the early drying stage. The results showed that compared with CKD and OD, water removal was the fastest under SCD, and the drying rate was nine times of CKD and one time of OD. The shrinkage of SCD was the lowest among the three drying methods. Moisture distribution of SCD and OD was uneven. The drying stress of SCD was relatively high, the drying stress index of it was almost five times of CKD and three times of OD. Regardless of the drying method, shorter specimens had a shorter drying period but greater drying defects than the long specimens.

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“…The results indicated a significant decrease in the brittleness of the samples impregnated with in situ synthesized nano-copper modified PF resin. The PF-1-Cu resin absorbed more impact force and increased the toughness of the Chinese fir [35][36][37]. Compression experiments parallel to the growth direction were performed, shown in Figure 8b.…”

Section: Mechanical Properties Of Chinese Fir After Impregnationmentioning

confidence: 99%

Incorporation of In Situ Synthesized Nano-Copper Modified Phenol-Formaldehyde Resin to Improve the Mechanical Properties of Chinese Fir: A Preliminary Study

Huang

et al. 2021

Polymers

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Phenol-formaldehyde (PF) resin, modified using nano-copper with varying contents (0 wt%, 1 wt%, 3 wt%), was manufactured to improve the mechanical properties of Chinese fir. The morphology, chemical, micromechanical and micromechanical properties of the samples were determined by transmission electron microscopy (TEM), atomic force microscopy (AFM), environmental scanning electron microscopy (ESEM), Fourier transform infrared spectroscopy (FTIR), nanoindentation (NI) and traditional mechanical testing. The TEM and AFM results indicated that the in situ synthesized nano-copper particles were well-dispersed, and spherical, with a diameter of about 70 nm in PF resin. From the FTIR chemical changes detected by FTIR inferred that the nano-copper modified PF resin penetrated into the Chinese fir cell walls and interacted with the acetyl groups of hemicellulose by forming a crosslinked structure. Accordingly, the micro-mechanical properties of the Chinese fir cell walls were enhanced after treatment with nano-copper modified PF resin. The filling of the PF-1-Cu resin (1 wt% nano-copper) in the wood resulted in 13.7% and 22.2% increases in the elastic modulus (MOE) and hardness, respectively, of the cell walls. Besides, the impact toughness and compressive strength of the Chinese fir impregnated with PF-1-Cu resin were 21.8% and 8.2% higher than that of the PF-0-Cu resin. Therefore, in situ synthesized nano-copper-modified PF resin is a powerful treatment method for Chinese fir due to improved diffusive properties and reinforcement of the mechanical properties.

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Use impregnation and densification to improve mechanical properties and combustion performance of Chinese fir

Cited by 52 publications

References 29 publications

Flame Retardant Properties and Thermal Decomposition Kinetics of Wood Treated with Boric Acid Modified Silica Sol

Flame Retardant Properties and Thermal Decomposition Kinetics of Wood Treated with Boric Acid Modified Silica Sol

Drying Characteristics of Eucalyptus urophylla × E. grandis with Supercritical CO2

Incorporation of In Situ Synthesized Nano-Copper Modified Phenol-Formaldehyde Resin to Improve the Mechanical Properties of Chinese Fir: A Preliminary Study

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