Chemical alterations of pine wood saccharides during heat sterilisation

Kačík, František; Šmíra, Pavel; Kačíková, Danica; Veľková, Veronika; Nasswettrová, Andrea; Vacek, V.

doi:10.1016/j.carbpol.2014.10.065

Cited by 26 publications

(10 citation statements)

References 49 publications

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“…Cellulose is relatively stable to thermal treatment. However, minor degradation occurs at relatively low temperatures [60], but it is not as strongly affected as the hemicelluloses. The results of SEC analyses (Table 3, Figure 6) show that the temperature of 160 • C affects the length of the cellulose chain only slightly and the changes in degree of polymerization (DP) are not significant.…”

Section: Changes Of Macromolecular Traits In Lignin and Polysaccharidesmentioning

confidence: 97%

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

2020

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Thermal modification of wood causes chemical changes that significantly affect the physical, mechanical and biological properties of wood; thus, it is essential to investigate these changes for better utilization of products. Fourier transform infrared spectroscopy and size exclusion chromatography were used for evaluation of chemical changes at thermal treatment of oak wood. Thermal modification was applied according to Thermowood process at the temperatures of 160, 180 and 210 °C, respectively. The results showed that hemicelluloses are less thermally stable than cellulose. Chains of polysaccharides split to shorter ones leading to a decrease of the degree of polymerization and an increase of polydispersity. At the highest temperature of the treatment (210 °C), also crosslinking reactions take place. At lower temperatures degradation reactions of lignin predominate, higher temperatures cause mainly condensation reactions and a molecular weight increase. Chemical changes in main components of thermally modified wood mainly affect its mechanical properties, which should be considered into account especially when designing various timber constructions.

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Section: Changes Of Macromolecular Traits In Lignin and Polysaccharidesmentioning

confidence: 97%

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

2020

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“…However, changes in the crystalline and amorphous proportion of cellulose can also greatly affect the mechanical properties of treated wood. After thermal treatment, spruce wood exhibits decreased mechanical properties and cellulose, especially hemicellulose (Yildiz et al 2006;Kacik et al 2015). Multiple authors have published the correlation between the hemicellulose content and the flexural strength (Winandy and Lebow 2001;Esteves et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Fire Resistance of Thermally Modified Spruce Wood

Čekovská¹,

Gaff²,

Osvald³

et al. 2016

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The risk of possible ignition and burning is one of the greatest disadvantages of using wood as a construction material. An environmentally appropriate method of improving the fire-resistant properties of wood is available via thermal treatment. In this study, spruce wood (Picea abies L.) was thermally modified at 160 °C, 180 °C, and 210 °C. The effect of thermal modification on the fire performance of the wood, including weight loss and burn rate, was evaluated. A new testing method was designed to be sufficiently sensitive to monitor fire performance. The results showed that the thermally modified spruce wood had a lower weight loss than untreated wood. The burn rate of wood that was thermally modified at 160 °C was similar to that of untreated wood. Higher thermal treatment temperatures caused a higher burn rate. After the flame was removed, the burning process was rapidly stopped in thermally treated wood.

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“…The formation of chromophoric products by lignin scission and the removal of extractives from the interior to the exterior of wood is responsible for the color change of wood (Chang et al 1999;Kačĺk et al 2014). Huang et al (2012b) found that photodegradation tended to occur in the middle lamella of the wood surface cells where the lignin concentration in the cell wall is the highest, demonstrating the high photosensitivity of lignin when exposed to weathering.…”

Section: Introductionmentioning

confidence: 99%

Influence of Post-extraction on Photostability of Thermally Modified Scots Pine Wood during Artificial Weathering

Shen¹,

Cao²,

Sun³

et al. 2016

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The photo-stabilizing effect of post-extraction was evaluated for thermally modified wood. Extracted and non-extracted thermally modified Scots pine (Pinus sylvestris L.) samples were exposed in a xenon weather-ometer for 1008 h, and the surface color and chemical changes were characterized using a chroma meter, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). The results showed that: (1) the weight losses of thermally modified wood were higher than those of unmodified wood after extraction due to the leaching of some low molecular weight compounds that were generated during thermal modification; (2) the photodegradation of thermally modified wood during weathering was hindered by the presence of extractives; and (3) the color change during weathering was a little more severe in sapwood than in heartwood because more extractives were present in heartwood.

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Chemical alterations of pine wood saccharides during heat sterilisation

Cited by 26 publications

References 49 publications

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

Fire Resistance of Thermally Modified Spruce Wood

Influence of Post-extraction on Photostability of Thermally Modified Scots Pine Wood during Artificial Weathering

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