Masson pine (Pinus massoniana 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 (E_r) and hardness (H) 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 E_r and H of the wood cell wall increased by 13.9% and 17.6%, respectively, and the E_r and H of the WPA coating applied to the wood decreased by 12.1% and 22.2%. The E_r and H of the interface between the coating and wood were lower than those near the coating’s surface. The E_r and H 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.

中文翻译：

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热改性对木材细胞壁和水性聚丙烯酸酯涂料纳米机械性能的影响

在不同的处理温度（150、170和190°C）下对马尾松（Pinus massoniana Lamb。）样品进行热处理，并用水性聚丙烯酸酯（WPA）涂覆木材细胞壁的纳米机械性能。比较了漆产品。弹性模量（E _r）和硬度（H通过纳米压痕法对木细胞壁和涂层进行了测量和表征，并通过化学成分分析，接触角分析和比色分析研究了热改性过程中机械性能的影响因素。结果表明，随着热处理温度的升高，水在木材表面的接触角和比色差增大，而纤维素和半纤维素的含量降低。为190℃，热变形后Ë _ř和ħ木材细胞壁分别增加13.9％和17.6％，的和È _ř和ħ的WPA的涂层施加到木材下降了12.1％和22.2％。的涂层和木材之间的界面的E _r和H低于涂层表面附近的E _r和H。涂层和木材之间的界面处的细胞壁的E _r和H低于远离涂层的细胞壁的E _r和H。这项研究对于了解涂层与木质细胞壁之间的结合机理以及改善热改性后木质材料的表面处理技术具有重要意义。