Effects of combined zinc chloride-ultrasound pretreatment and thermal modification on the physicochemical properties of Moso bamboo

Zhang, Tianfang; Gao, Jingjing; He, Luxi; He, Zhengbin; Sangbong, Yi

doi:10.1016/j.jtice.2021.06.047

Cited by 15 publications

(2 citation statements)

References 40 publications

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“…With the increase of microwave power, time, and moisture content, the hydroxyl peak at 3450 cm − 1 was weaker than that of the untreated sample. This change was attributed to the reduction of free hydroxyl groups and the degradation of hemicellulose (Tianfang Zhang et al, 2021). The absorption peak at 1745 − 1 cm is the C = O stretching vibration of the acetyl group in hemicellulose, and is the same for both bamboos species, indicating the hemicellulose contents of the two species are the same.…”

Section: Ftir Analysismentioning

confidence: 99%

Effects of microwave softening treatment on dynamic mechanical and chemical properties of bamboo

Qin,

Yu,

et al. 2024

J Mater Sci

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Bamboo is a high-quality biomass material, but its thin walls and hollowness, limit subsequent processing. Softening can atten and bend bamboo without causing cracks, and thus enables e cient value-added use. In this study, the effects of microwave softening parameters (microwave power, processing time, and initial moisture content) on the glass transition temperature, compression ratio, microstructure, chemical composition, and surface wettability of Phyllostachys. edulis and Dendrocalamus. sinicus were studied. Microwave softening parameters (microwave power, treatment time, initial moisture content) improved the exibility and processability of both bamboo species. Dynamic mechanical analysis showed the storage modulus of D. sinicus slices was reduced from 7846 to 4498 MPa, which was 1.06 times higher than that of P. edulis. The glass transition temperature was lowered from 221.25 to 123.67°C, which was1.07 times higher than that of P. edulis, indicating bamboo stiffness was reduced and elasticity was enhanced. Moreover,P. edulis has higher thermoplastic quality than D. sinicus. Water molecules have a wetting and swelling effect on the cell wall. With a rise in water content, the free hydroxyl group increased, and the compression ratio of P. edulis with a moisture content of 90% increased from 15.65-45.54%, and that of D. sinicus increased from 11.31-41.67%. Hence, choosing the most adaptable bamboo species and moisture content, and increasing the softening temperature and softening time can improve the attening quality of bamboo and effectively reduce the number of hydroxyl and carbonyl groups, and thus offers a theoretical basis for the industrial processing of bamboo timbers.

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Section: Ftir Analysismentioning

confidence: 99%

Effects of microwave softening treatment on dynamic mechanical and chemical properties of bamboo

Qin,

Yu,

et al. 2024

J Mater Sci

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“…The presence of acids, produced from acetyl groups on hemicelluloses, accelerates the degradation of polysaccharide components. , These acids can be generated or added using catalysts. Commonly used catalysts include AlCl 3 , , H 2 SO 4 , Al 2 (SO 4 ) 3 , ,− ZnCl 2 , , H 3 PO 4 , oligolactic acid, and citric acid . Catalyst pretreatment reduces available sorption sites through adsorption-bridge reactions between metal ions and polar groups, leading to improved dimensional stability and reduced equilibrium moisture content until a certain level of mass loss. , …”

Section: Introductionmentioning

confidence: 99%

Heat Modification of Chinese Fir Wood Catalyzed by Fly Ash under Mild Temperature

Zhan,

Jiang,

Shi

et al. 2023

ACS Sustainable Chem. Eng.

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Heat modification (HM) can enhance the physical and mechanical properties of wood, but conventional HM (CoHM) requires high temperatures (above 180 °C) and consumes significant energy. Herein, fly ash was impregnated into Chinese fir for catalytic degradation at mild temperatures (100, 120, and 140 °C). After combining impregnation and HM (Im-HM) at mild temperatures, fly ash was deposited as Si-and Alrelated floccules on the surface of the modified wood. These floccules accelerated the degradation of hemicellulose, resulting in weight loss percentages (1.85−5.21%) similar to those achieved with CoHM treatment at 160, 180, or 200 °C. The chromaticity of the Im-HM samples approached that of the CoHM samples when treated at 200 and 220 °C. The Im-HM treatment also improved the water resistance and dimensional stability of the wood. The antiswelling efficiency of the Im-HM samples (16.50−33.80%) exceeded that of the CoHM samples modified at or below 180 °C (≤16.31%). The hydrophobicity of the wood was associated with the Im-HM temperature and duration. A greater hydrophobicity was obtained at higher temperatures or longer durations. Our findings demonstrate the feasibility of catalytic degradation through fly ash impregnation, which offers a potential method for producing sustainable wood products with enhanced properties.

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Chemical Preservation of Bamboo for Structural Application

Khadiran¹,

Lipeh²,

Uyup³

2023

Multifaceted Bamboo

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Effects of combined zinc chloride-ultrasound pretreatment and thermal modification on the physicochemical properties of Moso bamboo

Cited by 15 publications

References 40 publications

Effects of microwave softening treatment on dynamic mechanical and chemical properties of bamboo

Effects of microwave softening treatment on dynamic mechanical and chemical properties of bamboo

Heat Modification of Chinese Fir Wood Catalyzed by Fly Ash under Mild Temperature

Chemical Preservation of Bamboo for Structural Application

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