首页|Effect of compression on hydroscopicity of extracted Chinese fir heartwood
Effect of compression on hydroscopicity of extracted Chinese fir heartwood
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国家科技期刊平台
NETL
NSTL
万方数据
维普
In order to clarify the effects of extraction and compression on the hydroscopicity of wood, Chinese fir (Cunninghamia laneeolata Hook.) heartwood samples with or without extraction were radially or tangentially compressed under water-saturated condition at room temperature. Warm water and 1% sodium hydroxide were used as different solutions for extraction. Water absorp-tion capacity and moisture adsorption isotherms of the eornpressed samples were then tested. The fractai dimension of internal wood surfaces (Dfs) was calculated based on adsorption isotherms by FHH equation. Results showed that in both compressed groups, the hydroseopieity of samples extracted by sodium hydroxide solution improved greatly, while that of samples extracted by warm water changed little, compared with that of water-saturated samples. Recovery of set and the change of hydroscopic environment inside wood were main reasons for the difference of water absorption among water-saturated samples and samples extracted with warm water and sodium hydroxide solution. The swelling rate of samples extracted by sodium hydroxide solution significantly increased.Moreover, the swelling rate in the tangential direction of tangentially compressed samples was obviously higher than that in radial direction of radially compressed ones, Des values of woods extracted by warm water and sodium hydroxide solution decreased by 0.002 and 0.007 in a radially compressed group and by 0.013 and 0.013 in a tangentially compressed group, compared to those of water-saturated one. Therefore, the conclusion can be made that the extraction and compression treatments used in this study have no obvious effects on internal wood surface.
Chinese fircompressionextractionhydroscopieityfractal dimension
ZHENG Xin、CAO Jin-zhen、MAO Jia
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College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, P. R. China
国家科技期刊平台
NSTL
万方数据
维普
