Structural Characterization of the Variable Uptake and Distribution of Impregnation Fluids in Fast-Growing Poplar Hybrids

由于阔叶树的可得性稳步增加，阔叶树在未来将不断获得经济和科学上的关注。除了与森林有关的木材品种外，用于农林业目的的速生木材品种，如杨树，正越来越多地用于以木材为基础的工业。然而，在室外应用中，许多硬木物种对生物降解的耐久性较低。保护木材的基本前提是木材防腐剂或改性剂的深度和均匀浸渍。然而，许多硬木经常显示不正确和不均匀渗透和浸渍流体的分布。到目前为止，对其原因还没有完全的研究。因此，本课题通过杨树不同的氢化物进行研究，在浸渍过程中，由于解剖原因（如反应木、泰酮、细胞参数等）导致宏观和微观层面的氢化物分布不均匀。为了回答这个问题，将样品浸渍在含有荧光染料（即罗丹明B）的溶液中，并通过光学和扫描电子显微镜进行检查。此外，通过显微计算机断层扫描，对杨树的解剖结构和管腔填充浸渍化学物质（即甲基丙烯酸酯）的分布进行了三维分析。

Due to the steadily increasing availability of hardwoods, hardwoods will continuously gain economic and scientific interest in future. In addition to forest-relevant wood species, fast-growing wood species for agroforestry purposes, such as poplar, are becoming increasingly available to the wood-based industry. In outdoor applications, however, many hardwood species have a low durability against biological degradation. A fundamental prerequisite for the protection of the wood applied is a deep and homogeneous impregnation with wood preservatives or modification agents. However, many hardwoods reveal often an improper and uneven penetration and distribution of impregnation fluids. Up to now, the cause of this has not been completely researched yet. Therefore, this research project investigates by means of different hydrides of poplar, which anatomical causes (e.g. reaction wood, tyloses, cell parameters) lead to the uneven distribution on the macroscopic and microscopic level during impregnation. To answer that samples are impregnated with a solution, containing a fluorescent dye (i.e. Rhodamine B), and examined through light and scanning electron microscopy. In addition, the poplar anatomy and the distribution of a lumen-filling impregnation chemical (i.e. methacrylate) are analyzed three-dimensionally by means of micro-computed tomography.