文献类型：期刊文献

英文题名：Influence of hygrothermal condition on dynamic viscoelasticity of Chinese fir (Cunninghamia lanceolata). Part 2: Moisture desorption

作者：Zhan, Tianyi[1,2] Jiang, Jiali[1,2] Lu, Jianxiong[2] Zhang, Yaoli[3] Chang, Jianmin[3]

第一作者：Zhan, Tianyi

通信作者：Lu, Jianxiong

机构：[1] College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China; [2] State Key Laboratory of Tree Genetics and Breeding, Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China; [3] College of Materials Science and Technology, Beijing Forestry University, Beijing, 100083, China

年份：2018

卷号：72

期号：7

起止页码：579-588

外文期刊名：Holzforschung

收录：EI(收录号：20181705058374)

语种：英文

外文关键词：Mechanical testing - Moisture - Desorption - Hydrogen bonds - Dynamics

摘要：The influence of hygrothermal condition on dynamic viscoelasticity of Chinese fir (Cunninghamia lanceolata) during the moisture desorption (MDes) process was investigated. The ambient hygrothermal environments were set up as a series of constant temperatures and two relative humidity (RH) modes (RHramp-down and RHisohume). The MDes provided space for the rearrangement of the hydrogen bonds (Re-HB) and caused a mechano-sorptive (MS) effect. The enhancement of the Re-HB effect negatively correlated with the increment of loss modulus, while the elevation of the MS and the heating effects intensified the loss modulus. Lower values of RHc, determining the plateau area of loss modulus, were obtained at higher temperatures or greater RH ramping rates. The residual instability in the wood cell wall was quantitatively characterized by the extent of the MS effect. Residual instability was inversely proportional to the RHisohume level during the MDes process. The study of time dependent viscoelastic properties under moisture changing process provided insight into the condition of adsorbed water in the cell wall and optimized the manufacturing technique involved in the thermo-hygro-mechanical treatment of wood. ? 2018 Walter de Gruyter GmbH, Berlin/Boston 2018.