文献类型：期刊文献

英文题名：Dynamic viscoelastic properties of wood treated by three drying methods measured at high-temperature range

作者：Jiang, Jiali[1] Lu, Jianxiong[1] Yan, Haopeng[1]

第一作者：蒋佳荔

通信作者：Lu, JX[1]

机构：[1]State Forestry Adm, Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol, Beijing 100091, Peoples R China

年份：2008

卷号：40

期号：1

起止页码：72-79

外文期刊名：WOOD AND FIBER SCIENCE

收录：;EI(收录号：20080811109709);Scopus(收录号：2-s2.0-39149141065);WOS:【SCI-EXPANDED(收录号:WOS:000252656800009)】；

语种：英文

外文关键词：Chinese fir; dynamic viscoelastic properties; different drying methods; micro-Brownian motion; apparent activation energy

摘要：The heartwood of Chinese fir was dried by high-temperature drying (HTD), low-temperature drying (LTD), and freeze-vacuum drying (FVD), respectively. The dynamic viscoelastic properties were investigated at a temperature range from 30 to 280 degrees C at frequencies of 0.5-10 Hz using the technique of Dynamic Mechanical Analysis (DMA). The results showed that two relaxations labeled as a and P were detected in the order of the decreasing temperatures at which they occurred, attributed to the micro-Brownian motion of the amorphous cell-wall polymers and the molecular motion of lignin, respectively. The loss peak temperature in beta relaxation of HTD wood was the lowest, probably because of the degradation of hemicellulose in the amorphous region. The highest apparent activation energy (Delta E) of HTD wood suggested that more bonds among molecular chains were broken in its segmental motion.