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

通过特定材料改性同时成型和固定单板，后续应用：固化和成型过程的机制

基本信息

批准号：
166393996
负责人：
Professor Dr.-Ing. Alexander Pfriem
金额：
--
依托单位：
Fachbereich Holzingenieurwesen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/166393996?language=en
关键词：
Simultaneous shaping fixation veneer specific

项目摘要

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.

用糠醇/马来酸酐浸渍法对木质单板进行增塑处理。在浸渍和模制之后，热诱导的酸催化聚合导致在细胞壁内形成聚合物，并固定模制单板的实现形状。计划中的后续项目旨在进一步加深对化学增塑和改性木单板成型行为的了解。因此，相当重视的是分析和转移的机制的变化的热，动态力学，和模塑行为的浸渍单板样品到实验室规模。已经获得的关于塑化，聚合和影响参数的知识将得到发展，扩展和完善。持续项目的主要重点可以分为三个独立的领域：固化步骤的微观研究，动态机械热分析（DMTA）结合热重研究，以研究粘弹性，并分析有关的材料行为时，木单板成型与固化相结合。这些调查的结果将提供一个更好的了解材料的行为变化，在塑化过程中，在高温下，并在组合成型和固化过程。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本进行，以确定浸渍前后以及固化期间和之后的动态力学性能。这种方法将减少差异和不准确性，这是在每个工艺步骤中使用不同木材样品观察到的。将分析改性化学结构、应用工艺技术以及材料的成型和机械性能之间确定的相互关系，以确定它们对工艺过程的普遍适用性和可转移性。根据所获得的结果，关于成型和定型的技术将进一步发展和适应。通过调整化学成分、工艺流程和工艺步骤，实现特定的材料性能。这些材料特性将与从解剖学、热学和动态力学分析中获得的结果相关，并将定义结构-特性-关系。