Effects of heat treatment on the chemical compositions and thermal decomposition kinetics of Japanese cedar and beech wood

Chien, Yi-Chi; Yang, Teng‐Kuei; Hung, Ke-Chang; Li, Cheng-Chun; Xu, Jingdong; Wu, June H.

doi:10.1016/j.polymdegradstab.2018.11.003

Cited by 55 publications

(25 citation statements)

References 57 publications

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“…However, the MOR decreased as the treatment time increased because of the degradation of hemicellulose, but the change was not obvious as compared to the control. The treatment time is extended mainly to extend the time of the internal reaction of the molecule and store more intermolecular activation energy [ 23 ], causing the hemicellulose to continue to degrade. When the temperature was 160 °C and the treatment time was 2 h and 4 h, the MOR decreased for the continuous degradation of hemicellulose.…”

Section: Resultsmentioning

confidence: 99%

Effects of One-Step Hot Oil Treatment on the Physical, Mechanical, and Surface Properties of Bamboo Scrimber

Yuan

Wang

et al. 2020

Molecules

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Bamboo scrimber is a new type of bamboo-based panel that is prone to be affected by biological and service environments under outdoor conditions. In this paper, the physical and mechanical performance and the microchemical and surface properties of untreated and hot-oil-treated bamboo scrimber were analyzed to illustrate the processing mechanism of scrimber. Methyl silicone oil treatment was carried out at 120, 140, and 160 °C for 2, 4, and 6 h. The density, mechanical properties, air-dried moisture content, surface morphology, chemical structure, swelling properties, color, and contact angle of the bamboo scrimber were analyzed to evaluate the treatment effectiveness. Observation of the environmental-scanning electron microscope indicated that the glue layer of the bamboo scrimber was not significantly damaged after hot oil treatment. At low temperatures, the mechanical properties did not change significantly. Infrared-spectrum analysis showed a significant decrease in mechanical properties at higher temperatures and longer treatment time for the degradation of hemicellulose. The contact angle test and swelling properties test showed that the hot oil treatment improved the dimensional stability and reduced the wettability on the surface of the bamboo scrimber. The above analysis results show that the treatment at 140 °C for 2 h is most effective.

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Section: Resultsmentioning

confidence: 99%

Effects of One-Step Hot Oil Treatment on the Physical, Mechanical, and Surface Properties of Bamboo Scrimber

Yuan

Wang

et al. 2020

Molecules

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“…There is a decrease in the O/C ratio which is accompanied by degradation of the less ordered carbohydrate regions, hemicellulose depolymerisation accompanied by the generation of acetic acid, furfural products, aldehydes and lignin breakdown/modification [41][42][43][44][45][46]. Hemicellulose (acetic acid, furfural, methyl furfural, hydroxy methyl furfural) and lignin (acetic acid, guaiacol, syringol, vanillin, syringaldehyde, acetovanillone, acetosyringone) degradation products are found in increasing amounts as treatment temperature is increased [25] or with increase in treatment pressure in closed systems [23].…”

Section: Degradation Processesmentioning

confidence: 99%

Thermal modification of wood—a review: chemical changes and hygroscopicity

2021

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Thermal modification is a well-established commercial technology for improving the dimensional stability and durability of timber. Numerous reviews of thermally modified timber (TMT) are to be found in the scientific literature, but until now a review of the influence of cell wall moisture content during the modification process on the properties of TMT has been lacking. This paper reviews the current state of knowledge regarding the hygroscopic and dimensional behaviour of TMT modified under dry (cell wall at nearly zero moisture content) and wet (cell wall contains moisture) conditions. After an overview of the topic area, the review explores the literature on the thermal degradation of the polysaccharidic and lignin components of the cell wall, as well as the role of extractives. The properties of TMT modified under wet and dry conditions are compared including mass loss, hygroscopic behaviour and dimensional stability. The role of hydroxyl groups in determining the hygroscopicity is discussed, as well as the importance of considering the mobility of the cell wall polymers and crosslinking when interpreting sorption behaviour. TMT produced under wet processing conditions exhibits behaviour that changes when the wood is subjected to water leaching post-treatment, which includes further weight loss, changes in sorption behaviour and dimensional stability, but without any further change in accessible hydroxyl (OH) content. This raises serious questions regarding the role that OH groups play in sorption behaviour. Graphical abstract

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“…The degradation of hemicellulose is most likely the reason of this reaction, because of its low molecular weight. [34][35] The O-H groups are possibly transformed into ethers (O-R). One possible product is O-methyl (O-CH 3 ) groups by the influence of heat, which is related to the CH 3 asymmetric stretching vibration at 2959 cm -1 .…”

Section: O-h and C-h Stretching Regionmentioning

confidence: 99%

Surface Structural Transformation of Pre-carbonized Solid Biomass from Japanese Cedar via ATR-FTIR and PCA

2019

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This present research applied the ATR-FTIR technique and principle component analysis (PCA) to investigate molecular surface changes in the pre-carbonized solid biomass, so call Kindai Bio-coke and Japanese cedar which is utilized as an alternative to coal coke in the cupola furnace of the steel industry in order to reduce the CO 2 emissions. The aim is to explore what can be the key to improve the BIC products applications from the fundamental molecular scale by using PCA to distinguish between changes during the BIC transformation and the differences in BIC samples. Results revealed that transformation occured at the surface of Japanese cedar raw materials and Japanese cedar BIC. Major changes were observed in the O-H, C-H and CO stretching regions. The intensity of the IR bands attribute to aliphatic methyl (CH 3) and methylene (CH 2) stretching modes increased while a weak O-H stretching intensity associated with BIC hydrophobic characteristic decreased.

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Effects of heat treatment on the chemical compositions and thermal decomposition kinetics of Japanese cedar and beech wood

Cited by 55 publications

References 57 publications

Effects of One-Step Hot Oil Treatment on the Physical, Mechanical, and Surface Properties of Bamboo Scrimber

Effects of One-Step Hot Oil Treatment on the Physical, Mechanical, and Surface Properties of Bamboo Scrimber

Thermal modification of wood—a review: chemical changes and hygroscopicity

Surface Structural Transformation of Pre-carbonized Solid Biomass from Japanese Cedar via ATR-FTIR and PCA

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