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在常规解剖特征分析的基础上,采用氮气吸附法对杨木应拉木的比表面积及孔径分布等孔结构参数进行研究,并通过解析氮气吸附等温线判断孔隙的形状。结果表明:杨木应拉木BET比表面积为21.9m2.g-1,是对应木的13倍;杨木应拉木试样具有完好的介孔特征(孔径2～50nm),并具有一定量的微孔和大孔;内部存在“墨水瓶”状和狭缝状孔隙,孔径为5nm的孔体积分布密度最大,孔径在4～7nm的孔体积占总孔体积的74.4%,孔径超过15nm的孔体积占总体积的10.8%。杨木应拉木中大量存在的中孔孔隙可归因于应拉木木纤维中的厚壁胶质层。
Based on the analysis of conventional anatomical features, the pore structure parameters such as specific surface area and pore size distribution of poplar wood were studied by nitrogen adsorption method, and the pore shape was determined by analyzing the nitrogen adsorption isotherm. The results showed that the BET specific surface area of poplar wood was 21.9m2.g-1, which was 13 times that of corresponding wood. The poplar wood sample had good mesopore characteristics (pore size 2 ~ 50nm), and had a certain amount of micropores and Large pores; the internal existence of “ink bottle” -shaped and slit-like pores, pore volume 5nm pore volume distribution density of the largest pore size in the 4 ~ 7nm pore volume accounted for 74.4% of the total pore volume, pore size than 15nm pore volume Accounting for 10.8% of the total volume. The large number of mesopore pores present in poplar wood should be attributed to the thick-grained gummy layer in the wood fibers that should be pulled.