Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic Coating
Masson pine (<i>Pinus massoniana</i> Lamb.) samples were heat-treated at different treatment temperatures (150, 170, and 190 °C), and the nano-mechanical properties of the wood cell wall, which was coated with a waterborne polyacrylic (WPA) lacquer product, were compared. The elastic mod...
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| Format: | Article |
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MDPI AG
2020-11-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/11/12/1247 |
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| author | Yan Wu Xinyu Wu Feng Yang Haiqiao Zhang Xinhao Feng Jilei Zhang |
| author_facet | Yan Wu Xinyu Wu Feng Yang Haiqiao Zhang Xinhao Feng Jilei Zhang |
| author_sort | Yan Wu |
| collection | DOAJ |
| description | Masson pine (<i>Pinus massoniana</i> Lamb.) samples were heat-treated at different treatment temperatures (150, 170, and 190 °C), and the nano-mechanical properties of the wood cell wall, which was coated with a waterborne polyacrylic (WPA) lacquer product, were compared. The elastic modulus (<i>E</i><sub>r</sub>) and hardness (<i>H</i>) of wood cell wall and the coating were measured and characterized by nanoindentation, and the influencing factors of mechanical properties during thermal modification were investigated by chemical composition analysis, contact angle analysis, and colorimetric analysis. The results showed that with the increase in the heat treatment temperature, the contact angle of the water on the wood’s surface and the colorimetric difference increased, while the content of the cellulose and hemicelluloses decreased. After thermal modification of 190 °C, the <i>E</i><sub>r</sub> and <i>H</i> of the wood cell wall increased by 13.9% and 17.6%, respectively, and the <i>E</i><sub>r</sub> and <i>H</i> of the WPA coating applied to the wood decreased by 12.1% and 22.2%. The <i>E</i><sub>r</sub> and <i>H</i> of the interface between the coating and wood were lower than those near the coating’s surface. The <i>E</i><sub>r</sub> and <i>H</i> of the cell wall at the interface between the coating and wood were lower than those far away from the coating. This study was of great significance for understanding the binding mechanism between coating and wood cell walls and improving the finishing technology of the wood materials after thermal modification. |
| first_indexed | 2024-03-10T14:35:17Z |
| format | Article |
| id | doaj.art-b9d318d55b7c4d4e804454ea0b08e5de |
| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-10T14:35:17Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Forests |
| spelling | doaj.art-b9d318d55b7c4d4e804454ea0b08e5de2023-11-20T22:14:54ZengMDPI AGForests1999-49072020-11-011112124710.3390/f11121247Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic CoatingYan Wu0Xinyu Wu1Feng Yang2Haiqiao Zhang3Xinhao Feng4Jilei Zhang5College of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, ChinaBeijing Institute of Fashion Technology, Fashion Accessory Art and Engineering College, Beijing 100029, ChinaCollege of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, ChinaDepartment of Sustainable Bioproducts, Mississippi State University, Starkville, MS 39762, USAMasson pine (<i>Pinus massoniana</i> Lamb.) samples were heat-treated at different treatment temperatures (150, 170, and 190 °C), and the nano-mechanical properties of the wood cell wall, which was coated with a waterborne polyacrylic (WPA) lacquer product, were compared. The elastic modulus (<i>E</i><sub>r</sub>) and hardness (<i>H</i>) of wood cell wall and the coating were measured and characterized by nanoindentation, and the influencing factors of mechanical properties during thermal modification were investigated by chemical composition analysis, contact angle analysis, and colorimetric analysis. The results showed that with the increase in the heat treatment temperature, the contact angle of the water on the wood’s surface and the colorimetric difference increased, while the content of the cellulose and hemicelluloses decreased. After thermal modification of 190 °C, the <i>E</i><sub>r</sub> and <i>H</i> of the wood cell wall increased by 13.9% and 17.6%, respectively, and the <i>E</i><sub>r</sub> and <i>H</i> of the WPA coating applied to the wood decreased by 12.1% and 22.2%. The <i>E</i><sub>r</sub> and <i>H</i> of the interface between the coating and wood were lower than those near the coating’s surface. The <i>E</i><sub>r</sub> and <i>H</i> of the cell wall at the interface between the coating and wood were lower than those far away from the coating. This study was of great significance for understanding the binding mechanism between coating and wood cell walls and improving the finishing technology of the wood materials after thermal modification.https://www.mdpi.com/1999-4907/11/12/1247Masson pinenanoindentationthermal modificationcoatingnano-mechanical properties |
| spellingShingle | Yan Wu Xinyu Wu Feng Yang Haiqiao Zhang Xinhao Feng Jilei Zhang Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic Coating Forests Masson pine nanoindentation thermal modification coating nano-mechanical properties |
| title | Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic Coating |
| title_full | Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic Coating |
| title_fullStr | Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic Coating |
| title_full_unstemmed | Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic Coating |
| title_short | Effect of Thermal Modification on the Nano-Mechanical Properties of the Wood Cell Wall and Waterborne Polyacrylic Coating |
| title_sort | effect of thermal modification on the nano mechanical properties of the wood cell wall and waterborne polyacrylic coating |
| topic | Masson pine nanoindentation thermal modification coating nano-mechanical properties |
| url | https://www.mdpi.com/1999-4907/11/12/1247 |
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