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Wood: Modifications, Coatings, Surfaces, and Interfaces
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Wood: Modifications, Coatings, Surfaces, and Interfaces

A topical collection in Coatings (ISSN 2079-6412). This collection belongs to the section "Thin Films".

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Editors

Dr. Emilia-Adela Salca

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Collection Editor
Faculty of Furniture Design and Wood Engineering, Transilvania University of Brasov, 5000068 Brasov, Romania
Interests: wood processing; wood modification; discolorations of wood; coatings
Special Issues, Collections and Topics in MDPI journals
Dr. Tomasz Krystofiak

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Collection Editor
Department of Wood Science and Thermal Techniques, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland
Interests: wood technology; adhesives and lacquer products; wood-based materials; technology; wood gluing; wood finishing
Special Issues, Collections and Topics in MDPI journals

Topical Collection Information

Dear Colleagues,

Wood has been used for centuries for many reasons due to its fibrous nature. It’s a raw material that can be used in indoor applications and, if treated efficiently, in outdoor application as well. However, wood has two main disadvantages which restrict its wider use: (1) susceptible to microbial or fungal degration/corrosion and (2) dimensional instability when subjected to a varied moisture content.

In light of these aspects, the preservation of wood quality is crucial in increasing its lifetime. From a practical point of view, the durability of protected surfaces to different factors is important. The most popular methods for wood preservation are heat treatment, impregnation, chemical modification and impregnation, or/and finishing. Among them, coatings and surface/interface modification are hot topics in recent years and are often discussed in many scientific groups. Some of the results from this scholarly activity have been presented in the Coatings journal.

This Topical Collection covers coatings, surfaces, and interfaces in the broader sense on wood science. Topics of interest include, but are not limited to, the following:

  • exterior wood coatings;
  • interior wood coatings;
  • wood modification;
  • wood finishing;
  • weathering performance;
  • UV cure coatings;
  • engineered wood products;
  • protection of ancient wooden buildings;
  • weathering and durability.

Dr. Emilia-Adela Salca
Dr. Tomasz Krystofiak
Collection Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the collection website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (4 papers)

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2022

10 pages, 1233 KiB  
Article
Investigation of Roughness and Adhesion Strength Properties of Pine and Poplar Wood Heat Treated in Air and under Vacuum after Artificial Aging
by Tomasz Krystofiak, Ahmet Can and Barbara Lis
Coatings 2022, 12(12), 1910; https://doi.org/10.3390/coatings12121910 - 6 Dec 2022
Cited by 4 | Viewed by 1691
Abstract
Heat treatment is an eco-friendly and efficient way to improve the defective properties of wood, such as its hygroscopic nature, the lack of dimensional stability, and low resistance against biological degradation, and to produce a green and sustainable wood material for construction and [...] Read more.
Heat treatment is an eco-friendly and efficient way to improve the defective properties of wood, such as its hygroscopic nature, the lack of dimensional stability, and low resistance against biological degradation, and to produce a green and sustainable wood material for construction and buildings. However, these treatments alter the substrates and could influence the performance of the coating products necessary to maintain the surface features in certain end-use sectors. In this study, the effects of heat treatment in air (HT) and under vacuum (VHT) on the surface properties of Scots pine (Pinus sylvestris L.) and poplar (Populus euramericana) wood were investigated. For this purpose, the samples were exposed to an artificial aging process. After the aging process, surface roughness and the adhesion strength behavior of the samples were measured. After the HT and VHT, poplar and pine wood samples showed different roughness. While the roughness value parallel to the fibers decreased in poplar wood, it increased in pine wood. The roughness value perpendicular to the fibers increased in both tree species. The maximum roughness value after UV aging was 62,622 in the VHT-200 group. Although with the UV ageing treatment, the adhesion strength was decreased in the samples heat treated in air, it was increased in the samples subjected to vacuum heat treatment. A lower loss of adhesion strength was observed in the heat-treated samples processed under vacuum compared to the heat-treated samples processed in air. Full article
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13 pages, 1866 KiB  
Article
Moisture Sorption of Wood Surfaces Modified by One-Sided Carbonization as an Alternative to Traditional Façade Coatings
by Maija Kymäläinen, Jakub Dömény and Lauri Rautkari
Coatings 2022, 12(9), 1273; https://doi.org/10.3390/coatings12091273 - 1 Sep 2022
Cited by 10 | Viewed by 1471
Abstract
Surface carbonization, or charring, of wooden cladding boards is a promising, low impact process that can substitute inorganic coatings. The char surface is inert and hydrophobic and possibly a long-lasting solution for exterior uses. To determine the performance of surface-charred wood, several sorption [...] Read more.
Surface carbonization, or charring, of wooden cladding boards is a promising, low impact process that can substitute inorganic coatings. The char surface is inert and hydrophobic and possibly a long-lasting solution for exterior uses. To determine the performance of surface-charred wood, several sorption experiments were established. Sapwood of two hardwoods (aspen, birch) and two softwoods (pine, spruce) were used as the experimental material, modified by contact charring and gas flame charring, including surfaces coated with oil for further protection. The results showed that flame charring modification is equal to a double layer of acrylic paint on primer in terms of permeability on all wood species, with higher moisture exclusion efficiency at high relative humidity. Contact charring modification presented much improved properties in comparison to both flame charring and acrylic paint in all implemented sorption experiments, but the dimensional stability was poor with strong cupping in wetting. However, hardwoods and especially birch exhibited less dimensional distortion than the other investigated species, and oiling further reduced the cupping. The contact charring modification produced more repeatable results with less impact from substrate and all wood species benefitted, whereas the flame charring modification is more dependent on inherent properties of the wood species, and does not seem to suit aspen as well as birch, and pine as well as spruce, although oiling affected the observed results. Full article
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12 pages, 3259 KiB  
Article
Gloss of Varnished MDF Panels Veneered with Sanded and Thermally Compressed Veneer
by Pavlo Bekhta, Barbara Lis, Tomasz Krystofiak, Maciej Tokarczyk and Nataliya Bekhta
Coatings 2022, 12(7), 913; https://doi.org/10.3390/coatings12070913 - 28 Jun 2022
Cited by 3 | Viewed by 1383
Abstract
The objective of this study was to investigate the gloss of different types of commercially manufactured varnish systems, including water-based (WB), polyurethane (PUR) and UV-cured (UV), applied on veneered MDF panels with sanded and thermally densified alder and birch wood veneers. The varnishes [...] Read more.
The objective of this study was to investigate the gloss of different types of commercially manufactured varnish systems, including water-based (WB), polyurethane (PUR) and UV-cured (UV), applied on veneered MDF panels with sanded and thermally densified alder and birch wood veneers. The varnishes were applied at various numbers of layers on veneered panels. The gloss was measured at three angles of incident light: 20°, 60° and 85°. Statistical analysis showed that the type of varnish, the number of layers, the pre-treatment process, the wood species and direction of wood fibers significantly affect gloss of the coatings of veneered MDF panels. The type of varnish had a dominant effect on gloss. The highest gloss values were measured for the UV-varnished surface, and the lowest for WB- and PUR-varnished surfaces. Gloss was enhanced with an increase in the number of layers. Birch veneer provided higher gloss values compared to alder veneer. The gloss values measured along the wood fibers were higher than those measured across the fibers. No significant differences were found between the coatings created on sanded and thermally densified veneers for the average gloss values measured along the fibers at angles 60° and 85°. This study could have practical applications for producing value-added furniture elements using low-value wood species pre-treated by thermal compression. Full article
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25 pages, 9595 KiB  
Article
Photostability of Oil-Coated and Stain-Coated Acetylated Hornbeam Wood against Natural Weather and Artificial Aging
by Fanni Fodor, Miklós Bak and Róbert Németh
Coatings 2022, 12(6), 817; https://doi.org/10.3390/coatings12060817 - 10 Jun 2022
Cited by 2 | Viewed by 1512
Abstract
Nine different environmentally friendly coatings were tested on natural and acetylated hornbeam wood, during natural weather exposure and xenon lamp irradiation. The coating performance of acetylated hornbeam, and the photostability properties of tested coatings were evaluated to offer suggestions regarding suitable and less-suitable [...] Read more.
Nine different environmentally friendly coatings were tested on natural and acetylated hornbeam wood, during natural weather exposure and xenon lamp irradiation. The coating performance of acetylated hornbeam, and the photostability properties of tested coatings were evaluated to offer suggestions regarding suitable and less-suitable coatings for the exterior use of acetylated hornbeam. On the one hand, acetylation decreased the coating absorbance of hornbeam. On the other hand, it made the wood more durable and dimensionally stable, all of which influences the outdoor performance of acetylated hornbeam. The color of acetylated hornbeam is not photostable; it brightens during photodegradation, and greys after leaching. For long-lasting color, acetylated hornbeam should be coated with dark pigmented stains and maintained regularly. Fungal degradation and cracking did not occur, but the wood is just as susceptible to wasp stripping as untreated hornbeam. In this study, 200-h-long xenon lamp irradiation resulted in a color similar to that caused by 1 month of weather exposure (April to May 2018, Sopron, Hungary). Full article
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