Effects of Periodic Temperature Changes on Stress Relaxation of Chemically Treated Wood

编号 zgly0000339016

文献类型 期刊论文

文献题名 Effects of Periodic Temperature Changes on Stress Relaxation of Chemically Treated Wood

学科分类 220.5540;木材学

作者 XieManhua  ZhaoGuangjie 

作者单位 CollegeofMaterialScienceandTechnology  BeijingForestryUniversity  Beijing100083  P.R.China 

母体文献 Forestry Studies in China;中国林学: 英文版 

年卷期 2004,6(4)

页码 45-49

年份 2004 

分类号 S781.2 

关键词 木材  化学处理  构造  应力驰豫  定期温度变化 

文摘内容 In order to clarify the relationship between the microstructural changes and the rheological behaviors of four chemically treated woods (delignified wood, hemicellulose-removed wood, DMSO swollen and decrystallization treated wood), the stress relaxation of wood with three different moisture contents was determined during periodic temperature changes. The experimental results show that after wood relaxation for 4 h at 25℃, the stress decays sharply when the temperature increases and 2 h later the stress recovers again when the temperature drops back to the original point. The additional stress relaxation, produced after temperature begins to increase, is mainly caused by the thermal swelling, molecular thermal movement and the break of a part of residual hydrogen bonds. The number of hydrogen bonds and the size and amount of cavities in various treated woods greatly affect themagnitude of the additional relaxed stress and the recovery stress。