Abstract
Fiber boards, like other wood-polymer composites, are widely used in construction. However, their service life is often less than that declared by the manufacturer, which is due to insufficient knowledge of the processes of degradation of polymer components of resin and wood filler under the influence of aggressive environmental factors. In this regard, the task is to reveal, using reflective IR spectroscopy, structural changes in the molecular structure of polymeric substances included in a wood fiber composite after heat aging, artificial UV radiation and exposure to direct sunlight. The results of the study showed that the IR spectra of all samples are identical, but differ in the intensity of individual absorption bands. This suggests that under the influence of aging factors, a free-radical rupture of hydrogen, hydrocarbon and ether bonds occurs in various functional groups of cellulose, hemicellulose, lignin and resin. At the same time, heat aging causes structural changes throughout the entire volume of the slab, and artificial UV irradiation destroys the surface layer about one millimeter thick. Sunlight during the summer season destroys the surface layer less than 0.5 mm thick and contributes to additional structuring of the polymer components of the resin and wood of the inner layers as a result of heating the board.
Highlights
In low-rise construction, there is an increase in the consumption of wood-based panels based on polymer binders
The method is informative for the study of wood and materials based on it [7] to [9], the goal is to assess the effect of aging factors on the structural changes of an aged wood fiber composite using IR spectroscopy
Thermal and photooxidation leads to disruption of the continuity of the surface layers of the material, increasing its roughness and porosity
Summary
In low-rise construction, there is an increase in the consumption of wood-based panels based on polymer binders. Their relatively low cost, light weight and manufacturability can significantly reduce material and time costs in the construction of such buildings. The service life of wood composites declared by manufacturers is often overestimated, which leads to a premature loss of performance of structures [1] to [3] This is due to the fact that when assessing their service life, the susceptibility of the polymer binder to aging under the influence of external non-mechanical factors, which lead to irreversible structural changes, is not fully taken into account [4] to [6]. The method is informative for the study of wood and materials based on it [7] to [9], the goal is to assess the effect of aging factors on the structural changes of an aged wood fiber composite using IR spectroscopy
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