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

由于硬木的可获得性稳步增加，硬木将在未来继续获得经济和科学利益。除了与森林有关的树种外，用于农林业的速生树种，如白杨，也越来越多地提供给木材工业。然而，在户外应用中，许多硬木物种对生物降解的耐久性较低。保护所用木材的基本先决条件是用木材防腐剂或改性剂进行深度和均匀的浸渍。然而，许多硬木经常暴露出浸渍流体的不适当和不均匀的渗透和分布。到目前为止，其原因尚未完全研究。因此，本研究以不同的白杨为材料，探讨了在浸渍过程中，由于解剖学原因（如反应木、纤维素、细胞参数等）导致其在宏观和微观水平上分布不均匀的原因。为了回答样品用含有荧光染料（即罗丹明B）的溶液浸渍，并通过光学和扫描电子显微镜检查。此外，白杨解剖和内腔填充浸渍化学品（即甲基丙烯酸酯）的分布进行了三维分析，通过显微计算机断层扫描。

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.