文献类型：期刊文献

英文题名：Effect of Low Temperature Cyclic Treatments on Modulus of Elasticity of Birch Wood

作者：Zhao, Liyuan[1] Lu, Jianxiong[1] Zhou, Yongdong[1] Jiang, Jinghui[1]

第一作者：Zhao, Liyuan

通信作者：Lu, JX[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China

年份：2015

卷号：10

期号：2

起止页码：2318-2327

外文期刊名：BIORESOURCES

收录：;EI(收录号：20153601249066);Scopus(收录号：2-s2.0-84928779423);WOS:【SCI-EXPANDED(收录号:WOS:000354642000030)】；

基金：This work was financially supported by a project of the Research Institute for New Forestry Technology of Chinese Academy of Forestry (CAFINT2013C09).

语种：英文

外文关键词：Low temperature treatment; Cyclic treatments; Modulus of elasticity; Viscoelastic properties; Crystallinity

摘要：The modulus of elasticity (MOE) of birch (Betula platyphylla) wood specimens with four different moisture content (MC) levels, i.e., watersaturated, green, air-dried, and oven-dried, were examined under a low temperature condition ranging from -196 degrees C (liquid nitrogen temperature) to +20 degrees C (room temperature). Dynamic mechanical analysis (DMA) was used to evaluate the dynamic viscoelastic properties before and after the low temperature treatment, while X-ray diffraction (XRD) was used to analyze the crystal structure. The results showed that MOE with different MC increased after the low temperature treatment. Specimens with higher MCs were more affected by the treatment than specimens with lower MCs. However, the effect of low temperature treatment (within four times) on MOE was not significant (P = 0.053 - 0.225). Cyclic treatments of liquid nitrogen did not decrease wood MOE. As a structural material, wood has a better residence to low temperatures compared to concrete, in which mechanical properties decreased dramatically after one cycle of low to room temperature.