美国花旗松心材与边材化学组成、结构及纤维性质

Chemical Composition and Structure and Fiber Properties between Heartwood and Sapwood of Pseudotsuga menziesii

以美国花旗松心材与边材为研究对象,分析比较它们的化学组成、结构和纤维性质的差异。结果表明:美国花旗松心材的热水抽提物、冷水抽提物、1%NaOH抽提物、苯醇抽提物的质量分数分别高出边材1.82%、3.10%、1.30%、2.88%。心材与边材的克拉森(Klason)木质素质量分数分别为26.54%和26.10%,综纤维素质量分数分别为71.11%和75.17%,α纤维素质量分数分别为46.78%和50.32%,半纤维素质量分数分别为24.33%和24.85%,聚戊糖质量分数分别为8.97%和8.51%。美国花旗松心材与边材纤维素、木质素和半纤维素红外光谱特征峰的变化与化学方法测定结果一致,心材与边材纤维的平均长度分别为2 863、3 463μm,长宽比分别为153和210,壁腔比分别为0.46和0.78,结晶度分别为51.48%和50.35%。综合来看,美国花旗松是制浆造纸和纤维板生产的良好原料。

An experiment was conducted to analyze the chemical composition and structure and fiber properties with the heart- wood and sapwood of Pseudotsuga menziesii as materials. The contents of cold water extracts, hot water extracts, 1% of NaOH extracts and phenethyl alcohol extracts in heartwood are 1.82%, 3.10% , 1.30% and 2.88% higher than those in the sapwood, respectively. The contents of Klason lignin, holocellulose, a-cellulose, semi-cellulose and pentosan in hear- twood and sapwood are 26.54% and 26.10%, 71.11% and 75.17%, 46.78% and 50.32% , 24.33% and 24.85%, 8.97% and 8.51% , respectively. By Fourier transform infrared spectroscopy, the characteristic peaks of cellulose, lignin and semi-cellulose in heartwood and sapwood are same to the results from chemical methods. In the heartwood and the sap- wood, the fiber lengths are 2 863 μm and 3 463 p,m, the length and width ratios are 153 and 210, the wall lumen ratios are O. 46 and O. 78, and the erystallinity are 51.48% and 50.35%. Therefore, Pseudotsuga rnenziesii is a good material for pulping and fiberboard production.