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BONDING ACETYLATED HORNBEAM WOOD (Carpinus betulus L.)

机译：粘接醋板木（Carpinus betulus L.）

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Hornbeam (Carpinus betulus L.) is a subsidiary tree species found in Hungary’s hill and mountain forests and it covers about 5.2% of the forest area. It can also be found almost all over Europe, from Sweden to Western Asia. In previous studies, it was found that acetylation – wood modification using acetic anhydride – improves the physical, mechanical, and also the durability properties of this wood species. The aim of this research was to examine the change of the bonding properties of hornbeam wood after acetylating it under industrial conditions. The compatibility of adhesives with modified wood is crucial to investigate, as changes in wood chemistry affect the bonding characteristics greatly, among other product-related properties like surface finishing and joinery with metal fasteners. In order to draw proper conclusions regarding this complex property, several tests were carried out concerning the wettability of the surface, testing the shear strength of solid wood samples and determining the bonding strength of samples glued with different adhesives. For the wettability properties, the surface energy was determined by the Sessile Drop Technique using water (polar) and diiodomethane (nonpolar) as probe liquids. The surface energy was determined for non-treated and acetylated hornbeam, on aged and non-aged surfaces, as well as on tangential and radial surfaces. Conclusions were drawn on the significance of these properties on the wettability of hornbeam. Tests regarding the shear strength of solid wood and the bonding strength were carried out on samples prepared in the same way, according to EN 205:2016. This way, conclusions were drawn regarding the bonding and shear strength change of wood before and after acetylation, as well as in conditioned, water-saturated or cooked state.
机译：角树（Carpinus betulus L.）是在匈牙利的丘陵和高山森林中发现的辅助树种，覆盖约5.2％的森林面积。从瑞典到西亚，它几乎遍布欧洲。在以前的研究中，发现乙酰化-使用乙酸酐对木材进行改性-可以改善该木材的物理，机械以及耐久性能。这项研究的目的是研究在工业条件下将鹅耳wood木乙酰化后其粘合性能的变化。胶粘剂与改性木材的相容性对于研究至关重要，因为木材化学变化极大地影响了粘合特性，此外还涉及其他与产品相关的性能，例如表面处理和金属紧固件的细木工。为了得出有关此复杂特性的正确结论，进行了一些有关表面润湿性的测试，测试了实木样品的剪切强度，并确定了用不同粘合剂粘合的样品的粘结强度。对于可湿性，通过Sessile Drop技术使用水（极性）和二碘甲烷（非极性）作为探针液体测定表面能。测定老化和未老化表面以及切线和径向表面上未经处理的乙酰化角树的表面能。结论是这些性质对角树的润湿性具有重要意义。根据EN 205：2016，对以相同方式制备的样品进行了有关实木剪切强度和粘结强度的测试。这样，就在乙酰化之前和之后以及在调节的，水饱和的或煮熟的状态下，木材的粘合力和剪切强度变化得出了结论。

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