Research activation energy in thermal modification of wood

Tsapko, Yuriy; Bondarenko, Olga; Horbachova, Oleksandra; Mazurchuk, Serhii; Buyskikh, Nataliya

doi:10.1051/e3sconf/202128007009

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…This does not diverge from the practical data well known from works [3,9], the authors of which, by the way, also associate a decrease in the quality of wood coating with a change in structural composition. But, unlike the results of studies published in [7,18,19], the obtained data on the effect of thermal modification on the properties of wood, in particular, on degassing, suggest the following:…”

Section: Discussion Of Results Of the Study Of Polymer Shell From Pow...contrasting

confidence: 76%

Determining patterns in the formation of a polymer shell by powder paint on wood surface

Tsapko

Likhnyovskyi²,

Buiskykh

et al. 2023

EEJET

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An issue related to using wood and wood products for building structures is to ensure their stability and durability during operation within wide limits. Therefore, the object of this study was a change in the properties of the polymer shell of powder paint on wood during thermal modification. It is proved that in the process of thermal modification of wood, its structure changes, and accordingly, during the polymerization of powder paint, degassing occurs, which affects the polymer shell. Namely, during the thermal polymerization of powder paint at a temperature of 180 °C for untreated wood, shallow bubbles and craters are characteristic of the formed polymer shell. Instead, a smooth surface is marked for a sample of thermally modified wood. Thermogravimetric analysis data show thermogravimetric curves characterized by the loss of mass of the sample of the original wood with increasing temperature due to the processes of dehydration, destruction of hemicellulose and lignin. This is dehydration, accompanied by the destruction of the pyranose cycle, and carbonization to form a carbon residue and a complex mixture of volatile products. Due to this, bubbles and craters are formed in the polymer shell of the coating. Based on the obtained results of adhesion of the polymer shell on wood, which is treated with a mixture of epoxy polyester system with functional additives and a polymerization temperature of 180 °C, the adhesion level is 2.1 MPa. Reducing the polymerization temperature of a mixture of the epoxy polyester system with functional additives to 130 °C increases adhesion by 1.75 times, and the nature of the destruction passes through the polymer shell. For thermally modified wood, the level of adhesion is within 2.1 MPa, and the destruction takes place through the wood. This is due to the increased fragility of the surface after thermal modification of wood

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Section: Discussion Of Results Of the Study Of Polymer Shell From Pow...contrasting

confidence: 76%

Determining patterns in the formation of a polymer shell by powder paint on wood surface

Tsapko

Likhnyovskyi²,

Buiskykh

et al. 2023

EEJET

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“…To address these problems, the state can encourage wood recycling and waste utilization, as well as incentivize entrepreneurs through preferential measures for sustainable forest management 18), 19) . In addition, it is relevant to find opportunities for better revenue sharing between stakeholder groups (business, society, and public authorities) to create fair and balanced forest management conditions.…”

Section: Sociocultural Valuementioning

confidence: 99%

“…Desertification and land degradation can cause a range of pressing environmental problems. These include reduced food production, water scarcity, loss of biodiversity, food insecurity, and the spread of infectious diseases 19) . Desertification can also lead to the loss of forest cover, shortage of wood resources, and decrease in drinking water reserves due to the loss of aquifers.…”

Section: Sociocultural Valuementioning

confidence: 99%

“…These organizations promote sustainable forest management, strengthen long-term political commitment, and provide financial assistance and technology transfer for sustainable forest development. They also work towards reconciling conflicts between groups, assisting national governments in pursuing key policy reforms, and developing criteria and indicators for sustainable forest management 19) .…”

Section: Sociocultural Valuementioning

confidence: 99%

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The Relevance of Sustainable Development of Forest Resource Reproduction in Kazakhstan

Kurmankul T. Abayeva,

Gaukhar M. Rakhimzhanova,

Myrzabayeva

et al. 2024

Evergreen

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Achieving sustainable development in modern conditions is one of the main goals of the state policy of any country. One of the important components of this concept is to ensure the reproduction of forest resources, which makes it relevant to analyse the development of this component in different countries. Thus, the purpose of the study was to assess the current state of sustainable development of forest resources in Kazakhstan and formulate recommendations for subsequent state policy in this area. The main research methods were analysis, historical, and abstraction. Within the framework of the study, forest management was assessed. The conclusion was formed that the state authorities of the country form an effective policy in this sphere. This, in turn, leads to long-term development in this sphere. The evolution of the decisions of the state authorities of the country was also traced, and its emphasis and peculiarities were assessed. In order to find solutions to the problems that still remain in this area, some actions that can be applied by the state were proposed. A special emphasis was placed in the context of the problems of forest ecology and sustainable development. Statistical data characterizing the development of forests in the country were used to confirm all the conclusions drawn. This work brings new knowledge to the study of sustainable development and ecology, as well as recommendations to increase the effectiveness of public policy in the field of forestry in Kazakhstan.

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“…The thermal timber modification was performed at temperatures of 190 °C and 220 °C for 10 hours. Both the activation energy [13] and the end of phase transitions were taken into consider-ation [14]. The samples were then treated with oil-wax and azure by immersion method with re-treatment after drying of the first layer in 24 hours [15].…”

Section: Examined Materials and Equipment Used In The Experimentsmentioning

confidence: 99%

Determining patterns in reducing the level of bio-destruction of thermally modified timber after applying protective coatings

Tsapko

Horbachova

Mazurchuk

et al. 2021

EEJET

Self Cite

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This paper reports the analysis of the biological destruction of timber and the use of protective materials, which established that the scarcity of data to explain and describe the process of bioprotection, neglect of environmentally friendly agents lead to the biodegradation of timber structures under the action of microorganisms. Devising reliable methods for studying the conditions of timber protection leads to designing new types of protective materials and application technologies. Therefore, it becomes necessary to determine the conditions for the formation of a barrier for bacteria permeability and to establish a mechanism for inhibiting material biodegradation. Given this, the dependence has been derived to determine the proportion of destroyed material under the effect of microorganisms when using an antiseptic-hydrophobicizer, which makes it possible to evaluate biopenetration. Based on the experimental data and theoretical dependences, the share of destroyed timber was determined under the effect of microorganisms, which is equal to 1 for natural timber. At the same time, this value for thermally modified timber is 0.033, and, when it is protected with oil ‒ 0.009, respectively, exposed to the action of microorganisms for 60 days. It should be noted that the presence of oil, wax, and azure leads to blocking the timber surface from penetration. Such a mechanism underlying the effect of protective coating is likely the factor in the process adjustment, due to which the integrity of the object is preserved. Thus, a polymer shell was created on the surface of the sample, significantly reducing the penetration of microorganisms inside the timber, while the loss of timber mass during biodestruction did not exceed 2.5 %. Therefore, there are grounds to assert the possibility of targeted control over the processes of timber bio-penetration by using coatings capable of forming a protective film on the surface of the material

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Research activation energy in thermal modification of wood

Cited by 7 publications

References 26 publications

Determining patterns in the formation of a polymer shell by powder paint on wood surface

Determining patterns in the formation of a polymer shell by powder paint on wood surface

The Relevance of Sustainable Development of Forest Resource Reproduction in Kazakhstan

Determining patterns in reducing the level of bio-destruction of thermally modified timber after applying protective coatings

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