人工林杨木热处理材力学强度变化研究  

Mechanical strength change of heat-treated planted poplar wood

作　　者：史蔷[1] 李如华[2] 

机构地区：[1]吉林农业科技学院,吉林132101 [2]中国林业科学研究院森环森保所,北京100091

出　　处：《木材加工机械》2014年第2期10-14,共5页Wood Processing Machinery

摘　　要：以过热蒸汽为传热介质和保护性气体,对杨木木材进行高温热处理,热处理时间分别为2h、4h、6h、8h;热处理温度分别为160℃、180℃、200℃、220℃,研究高温热处理后杨木木材力学性能变化趋势。试验表明,在热处理温度逐渐升高和热处理时间不断延长的条件下,杨木热处理材抗弯强度降低;弹性模量160℃时升高,然后降低。红外光谱分析表明,热处理使木材中的半纤维素、纤维素、木素发生降解反应,使木材力学强度降低。Poplar wood was heat-treated, experimental parameterst of emperature is namely 160℃, 180℃, 200℃, 220℃,and time is 2h, 4h, 6h, 8h, with the superheated steam as a heating medium and a shielding gas. The mechanical properties at different conditions are studied. The results show that MOR decreases, MOE goes up at 160℃ and then reduces, the FTIR analysis shows that heat-treatment made the cellulous, hemi-cellulous and lignin to turn up thermaldegradation, which results in the reduction of the mechanical properties of the heat-treated poplar wood.

关 键 词：杨木 热处理 抗弯强度 弹性模量 

分 类 号：S781.7[农业科学—木材科学与技术] S781.2[农业科学—林学]