Simultaneous shaping and fixation of veneer by specific material modification, Subsequent application: mechanisms of curing and forming process

木单板材可以通过糠醇/顺丁烯二酸酐浸渍来增塑。浸渍和模塑后的热诱导酸催化聚合导致在细胞壁内形成聚合物，并固定模塑单板的实现形状。计划中的后续项目旨在对化学增塑和改性木材单板的成型行为产生进一步和深入的了解。因此，对浸渍单板样品的热、动态机械和成型行为的变化机理的分析和转换受到了相当大的关注，并将其转移到实验室规模。已获得的塑化、聚合知识和影响参数将被开发、推广和完善。继续项目的主要重点可以分为三个不同的领域：固化步骤的微观研究，动态机械热分析(DMTA)与热重研究相结合的粘弹性研究，以及关于木材单板在成型和固化相结合时的材料行为的分析。这些研究的结果将有助于更好地了解塑化过程、高温过程以及模塑和固化过程中材料行为的变化。特别是，动态力学研究的结果将提供重要的信息，因为这些研究将使用单个样品来确定浸渍之前和之后以及在固化过程中和之后的动态机械性能。这种方法将减少每一工艺步骤使用不同木材样本所观察到的偏差和不准确性。将根据材料的一般适用性和可转移性，分析已确定的化学结构改良、应用工艺技术和材料的成型和机械性能之间的相互关系。根据所取得的成果，进一步发展和改进模压成型和模板固定技术。通过调整化学成分、工艺程序和工艺步骤，实现特定的材料性能。这些材料性能将与从解剖、热和动态-机械分析中获得的结果相关联，并将定义结构-性能-关系。

Wood veneer can be plasticized by furfuryl alcohol/maleic anhydride impregnation. A heat-induced acid-catalysed polymerisation after impregnation and moulding results in a polymer formed inside the cell wall and fixes the realized shape of the moulded veneer. The planned following-up project aims to generate further and deepened knowledge upon the moulding behaviour of chemically plasticized and modified wood veneer. Thereby, considerable attention is paid on analysing and transferring the mechanisms of the changed thermal, dynamic-mechanical, and moulding behaviour of impregnated veneer samples to laboratory scale. Already gained knowledge about plasticization, polymerisation, and the affecting parameter will be developed, extended, and completed. The main emphases of the continuing project can be divided in three separate fields: microscopic studies of the curing step, dynamic-mechanical thermo-analyses (DMTA) combined with thermo gravimetric studies to investigate viscoelastic properties, and analyses concerning the material behaviour of wood veneer when moulding is combined with curing. Results from those investigations will provide a better understanding of the changed material behaviour during plasticization, at elevated temperatures, and during the combined moulding and curing process. Especially, results from dynamic-mechanical studies will deliver important information since those studies will be performed using a single specimen to determine dynamic-mechanical properties prior to and after impregnation as well as during and after curing. This approach will reduce variances and inaccuracies, which have been observed using different wood samples for every process step. Identified interrelations between modified chemical structure, applied process technology, and the moulding and mechanical behaviour of the material will be analysed in respect of their general applicability and transferability to a technological process. According to the obtained results, the technologies regarding the moulding and form-fixation will be further developed and adapted. Specific material properties will be realized by adjusting the chemical composition, process procedure and process steps. Those material properties will be correlated to the results gained from anatomic, thermal, and dynamic-mechanical analyses and structure-property-relations will be defined.