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Toward improved understanding of the cell-wall density and porosity of wood determined by gas pycnometry

机译：通过气体比重瓶法可以更好地理解木材的孔壁密度和孔隙率

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摘要

The main objective of this study was to evaluate the effect of sample preparation on cell-wall density and porosity using gas pycnometry. Native and thermally modified twin samples of Norway spruce (Picea abies (L.) Karst.), sycamore maple (Acer pseudoplatanus L.), and European ash (Fraxinus excelsior L.) were analyzed. The samples differed in terms of shape, geometry, and climatic state. On the one hand, the samples were oven dry as usual and, on the other hand, conditioned at 22 ℃ and 95 ％ relative humidity. Furthermore, the samples were processed using solvent exchange drying. In addition to helium, nitrogen was used as a displacement gas. The tests show i.a. how this can lead to misinterpretation of the cell-wall density or porosity of wood determined by gas pycnometry. The results show that native spruce has a lower cell-wall density and higher porosity compared with native maple and ash. Due to thermal modification, the cell-wall densities are decreased. The investigations show that the determined cell-wall density and porosity of the wood are strongly dependent on the sample geometry and climatic state. The cell-wall densities of all investigated wood species in the conditioned state at 22 ℃ and 95 ％ relative humidity are significantly higher compared with the oven-dry cell-wall densities.
机译：这项研究的主要目的是使用气体比重瓶法评估样品制备对细胞壁密度和孔隙率的影响。分析了挪威云杉（Picea abies（L.）Karst。），美国梧桐枫（Acer pseudoplatanus L.）和欧洲烟灰（Fraxinus excelsior L.）的天然样品和热改性双样品。样品的形状，几何形状和气候状态有所不同。一方面，将样品照常烘箱干燥，另一方面，在22℃和95％相对湿度下进行调节。此外，使用溶剂交换干燥对样品进行处理。除了氦气，氮气还用作置换气体。测试显示如何通过气体比重瓶法对木材的细胞壁密度或孔隙率产生误解。结果表明，与天然枫木和灰烬相比，天然云杉具有较低的细胞壁密度和较高的孔隙率。由于热改性，细胞壁密度降低。研究表明，确定的木材孔壁密度和孔隙率在很大程度上取决于样品的几何形状和气候状态。在22℃和95％相对湿度下处于调节状态的所有木材种类的细胞壁密度均明显高于干燥的细胞壁密度。

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  • 来源
    《Wood Science and Technology》 |2013年第6期|1197-1211|共15页
  • 作者

    Mario Zauer; Alexander Pfriem; Andre Wagenfuehr;

  • 作者单位

    Institute of Wood and Paper Technology, Technische Universitaet Dresden, 01062 Dresden, Germany;

    Eberswalde University for Sustainable Development, Eberswalde, Germany;

    Institute of Wood and Paper Technology, Technische Universitaet Dresden, 01062 Dresden, Germany;

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