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林业科学 ›› 2022, Vol. 58 ›› Issue (5): 177-186.doi: 10.11707/j.1001-7488.20220518

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木材孔隙连通性评价研究进展

金枝,李伯涛,尹江苹,陈倩,付跃进*,吕斌   

  1. 中国林业科学研究院木材工业研究所 北京 100091
  • 收稿日期:2021-06-10 出版日期:2022-05-25 发布日期:2022-08-19
  • 通讯作者: 付跃进
  • 基金资助:
    国家自然科学基金项目(32001254)

Research Progress for the Evaluation of Wood Pore Connectivity

Zhi Jin,Botao Li,Jiangping Yin,Qian Chen,Yuejin Fu*,Bin Lü   

  1. Research Institute of Wood Industry, CAF Beijing 100091
  • Received:2021-06-10 Online:2022-05-25 Published:2022-08-19
  • Contact: Yuejin Fu

摘要:

木材孔隙之间形成的互通网络结构是木材中水分迁移、药剂渗透的主要途径,对木材干燥、浸渍和改性等工艺质量起着决定性作用,也是影响木质产品吸音、保温和调湿等功能特性的重要因素。当前,木材孔隙结构评价指标主要包括孔隙度、孔径与孔径分布、孔体积、密度、比表面积、孔隙形貌和分形维数等,针对孔隙连通性评价尚未开展全面、系统探索。本文围绕吸附分析法、核磁共振法和计算机断层扫描三维成像法3类孔隙表征技术在木材孔隙及连通性评价方面的研究进行回顾与总结,并提出科学问题与展望,旨在进一步促进木材原料孔隙特征信息深度挖掘,为木材高效利用及其制品质量提升提供有力数据支撑。今后,应在以下方面开展更深入的实践:1) 木材孔隙连通性评价体系构建,首先,形成木材孔隙连通性评价理论基础和研究方法,即对现有方法的适用性和准确性进行评估和验证,结合木材孔隙特征进一步修正理论模型并优化相应评价方法;其次,通过多种表征技术联合互补,完善评价范围及评价指标量化等研究内容,提高木材孔隙连通性评价体系的完整性与全面性。2) 木材孔隙空间拓扑结构解译,木材孔隙分布与连通在纵、径、弦向各不相同,孔径大小差异大,形貌多样且交联互通程度不一,具有十分复杂的空间拓扑结构。木材孔隙连通性评价研究可为木材孔隙空间拓扑结构解译开拓新的空间,在充分提炼特征指标参数的基础上,结合数据挖掘技术,通过对特征指标数据间潜在关系及规则的深度解析实现木材孔隙空间拓扑结构的全面解译,促进传统表征技术及评价体系的升级和优化。

关键词: 木材, 孔隙结构, 孔隙连通性, 孔隙表征技术

Abstract:

The interconnected pore network within wood is the main way of water migration and chemical penetration, which plays a decisive role in wood drying, wood impregnation and modification, and is also an important factor to affect the functional properties of wooden products, such as sound absorption, thermal insulation and humidity control. However, at present the main evaluation indexes of wood pore structure are porosity, pore size distribution, pore volume, density, specific surface area, pore morphology and fractal dimension, etc., and no comprehensive and systematic studies have been carried out on the evaluation of pore connectivity. In this paper, the research on the evaluation of wood pore structure and pore connectivity with three types of pore characterization techniques, those are the adsorption analysis method, the nuclear magnetic resonance method as well as the computed tomography three-dimensional imaging method, is reviewed and summarized. Furthermore, scientific problems and prospects are proposed as follows: 1) Construction of wood pore connectivity evaluation system: firstly, to form the evaluation theory basis and research method of wood pore connectivity, that is to evaluate and verify the applicability and accuracy of existing methods, and further modify the theoretical model and optimize the corresponding evaluation method based on wood pore characteristics. Secondly, to facilitate the research on the evaluation scope and evaluation index quantification by combination and complementarity of various characterization technologies for the integrity and comprehensiveness of wood pore connectivity evaluation system. 2) Interpretation of the topological structure of wood pore space: the pore space of wood is a very complex internal topological structure with different pore distributions and pore connectivities in the longitudinal, radial and tangential directions, and greatly distinct pore sizes as well as diverse morphologies which are cross-linked differently. The evaluation of wood pore connectivity will provide a wider perspective on the interpretation of wood pore topological structure. On the basis of the full refining of the characteristic index parameters, and combined with data mining technology, the wood pore topological structure will be comprehensively interpreted through deep analysis for the potential relationships and rules of the characteristic index data, so as to promote the upgrading and optimization of the traditional characterization technology and evaluation system.

Key words: wood, pore stucture, pore connectivity, pore characterization technique

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