Triethanolamine impregnation/steam synergistic softening of teakwood to improve bending properties and its mechanism

Yao, Linghua; Sun, Delin; Wang, Zhangheng; Yu, Minggong

doi:10.1080/17480272.2022.2057815

Cited by 5 publications

(3 citation statements)

References 58 publications

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“…Shen et al [9] studied the softening process of ammonia solution and steam synergistic treatment of teakwood by response surface methodology and analyzed the effects of alkali concentration, treatment temperature, and treatment time on the softening properties of wood, and the results showed that vacuum impregnation of ammonia solution was conducive to the softening bending of teakwood and mechanical properties such as maximum loading, bending strength, and elasticity modulus of specimens after drying and shaping were improved to a certain extent. Yao et al [10] adopted a synergistic treatment of triethanolamine and superheated steam to soften teakwood, and its bending properties were significantly improved, and explained the softening mechanism from the changes in chemical constituents, but lack of experimental studies on the process optimization and bending mechanics. Many studies have shown that the chemical-physical synergistic softening method can make the chemical solution enter into the crystalline and non-crystalline regions of wood under high temperature and humidity conditions, wetting cellulose, hemicellulose, and lignin, and providing enough space for molecular movement, as well as lowering the glass transition temperatures of the main constituents in the cell wall, which greatly improves the softening and bending effect of the wood [11,12], but it is prone to cause problems such as wood collapse, discoloration, environmental pollution, and so on [13,14].…”

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confidence: 99%

Preparation of Teakwood Bending Components with Excellent Softening Properties by Vacuum Impregnation with Triethanolamine Compounding Solution

Yao,

Ji,

Sun

et al. 2023

Forests

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To study the softening bending properties and mechanism of teakwood, it was extractively pretreated by using superheated steam, the triethanolamine compound was used as a softening solution, which was infiltrated into the wood by vacuum impregnation and synergistically softened through saturated steam to improve the bending properties of teakwood. Analysis by Fourier transform infrared spectroscopy (FTIR), Carbon 13 nuclear magnetic resonance (13C NMR), and X-ray photoelectron spectroscopy (XPS) showed that the synergistic softening treatment elevated the content of O and N elements in the softening solution and together with the C elements in the wood, formed C-NH2 and C-N bonds, which increased the molecular activity and improved the softening properties of teakwood. Scanning electron microscope (SEM) observations revealed that the outer conduits, cell walls, and fibrous tissue structures of the teakwood were stretched after softening and bending, and even microcracks of different degrees were formed between the cell walls. According to the load–deformation relationship of teakwood softening bending, the stress–strain relationship was theoretically derived and the bifold constitutive model of teakwood bending was constructed after fitting the constitutive relationship data, the integrated correlation coefficient R2 was 96.25%, which proved that the present model can better simulate the constitutive relationship of teakwood in bending.

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Section: Introductionmentioning

confidence: 99%

Preparation of Teakwood Bending Components with Excellent Softening Properties by Vacuum Impregnation with Triethanolamine Compounding Solution

Yao,

Ji,

Sun

et al. 2023

Forests

Self Cite

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“…Softening methods are mainly divided into physical and chemical methods. The former mainly includes boiling (Matsuo-Ueda et al, 2023;Zhang et al, 2023), steaming (Cao et al, 2023;Yao et al, 2023), microwave (Norimoto, 1979;Norimoto et al, 1980;Norimoto and Gril, 1989;Ganguly et al, 2021;Mascarenhas FJR. et al, 2023;Mascarenhas F. et al, 2023;Mascarenhas et al, 2024), and high-frequency heating methods (Norimoto and Gril, 1989).…”

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Effects of hydrothermal–microwave treatment on bending properties of teak in plantation

Huang,

Shen,

Zhang

et al. 2024

Front. Mater.

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In order to study the bending properties of tropical tree species rich in organic extracts, the effects of temperature and time on the bending performance of hydrothermal treatment were investigated. The effects of power and time on bending performance under microwave heating conditions were investigated. It is found that the chemical composition does not undergo obvious degradation at 80°C–100°C, and the bending performance gradually becomes better with the increase in heating time; when the hydrothermal time exceeds 4 h, the bending performance varies with heating time. The growth is better than the difference, reaching the maximum at 4 h. When the water temperature is 140°C, the bending performance is negatively correlated with the heating time. When the hydrothermal treatment time is the same, the bending property becomes better as the temperature increases. The most reasonable process for microwave softening heating is with a power of 480 W and a heating time of 4 min. A softening treatment method combining water heat and microwave can achieve a better softening effect. When the final moisture content is controlled to 8%, the bending setting effect is the best. The optimum drying time is 6 h, and the optimum drying temperature is 50°C.

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Triethanolamine impregnation/steam synergistic softening of teakwood to improve bending properties and its mechanism

Cited by 5 publications

References 58 publications

Preparation of Teakwood Bending Components with Excellent Softening Properties by Vacuum Impregnation with Triethanolamine Compounding Solution

Preparation of Teakwood Bending Components with Excellent Softening Properties by Vacuum Impregnation with Triethanolamine Compounding Solution

Effects of hydrothermal–microwave treatment on bending properties of teak in plantation

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