论文部分内容阅读
为延长木材的耐久性,分析其自身因素和表达。选枣木、水曲柳和杨木,测量木材和木质素的碳含量、氮含量,分析碳与氮的含量之比值,测量木质素含量、木质素密度、溶于水的木质素密度、溶于苯醇溶液的萃取物含量和总萃取物密度,比较木材及木质素的红外光谱图,研究愈创木基与紫丁香基的比值。结果表明:耐久性最好的枣木的气干密度为0.93 g/cm3;其红外光谱图在波长为1 633 cm-1,在羰基(C=O)的伸缩振动下,存在波峰;愈创木基与紫丁香基的比值为0.975;氮含量为0.274%,其木质素的氮含量为0.444%,在三种木材中为最小;枣木和其木质素的碳与氮含量之比分别为180和135,木质素密度为184.3±9.7 mg/cm3,总萃取物密度为88.1±3.5 mg/cm3,和水曲柳、杨木的比较,均为最大。
To extend the durability of wood, analyze its own factors and expression. Jujube, ash and poplar were selected to measure the carbon and nitrogen contents of wood and lignin, the ratio of carbon and nitrogen content, the lignin content, the lignin density, the water-soluble lignin density, The content of the extract and the total extract density in the alcoholic solution were compared with the infrared spectra of wood and lignin to study the ratio of guaiacyl and lilac. The results showed that the air-dried density of jujube with the best durability was 0.93 g / cm3. The infrared spectrum showed a peak at a wavelength of 1 633 cm-1 under the stretching vibration of carbonyl (C = O) The ratio of woody base to lilac base was 0.975; the nitrogen content was 0.274%, the nitrogen content of lignin was 0.444%, and the lowest among three woods; the ratio of carbon to nitrogen content of jujube wood and its lignin was 180 and 135, respectively. The lignin density was 184.3 ± 9.7 mg / cm3, the total extract density was 88.1 ± 3.5 mg / cm3, which was the largest compared with that of Fraxinus mandshurica and poplar.