木材多尺度孔隙结构及表征方法研究进展

Research Progress of Multi-Scale Pore Structure and Characterization Methods of Wood

介绍木材中宏观-介观-微观多尺度孔隙的分布、孔隙尺寸、孔隙形貌等孔隙结构,木材自身因素及干燥、热解等加工处理对孔隙结构的影响,压汞法等木材传统孔隙结构表征方法的优缺点,差示扫描热孔计法、核磁共振冷孔计法和超极化129Xe核磁共振法等新兴表征技术的基本原理,提出今后应结合多种表征技术重点探索木材介微观孔隙结构,以此为切入点探讨木材的物理力学性能,以期有助于推动木材孔隙结构的深入研究及其在其他领域的应用。

The pore structure in wood has significant influences on the modification and drying of wood. Hence,in the present work,there was an introduction to the macro-meso-micro pore distribution,pore size and pore shape in wood,effects of wood and treatments such as drying,pyrolysis etc. on the pore structure,the advantages and disadvantages of traditional characterization methods of pore structure,and fundamentals of DSC thermoporometry,NMR cryoporometry and hyperpolarized129 ^Xe NMR to get a better understanding of wood pore structure. Furthermore,several suggestions such as to study the mesopores and micropores in cell wall,especially the relationship between pore shape and water status and migration,to avoid influences of internal and external factors on wood pore structures research,to explain wood physical properties on the basis of wood pore structures and to explore wood pore structures by multi-technology were formed to contribute to the further research on the wood pore structure and application in other research area.