文献类型：期刊文献

英文题名：The differences of viscoelastic properties between the secondary wall S-2 layer and compound middle lamella of thermally treated wood

作者：Wang, Dong[1] Xiang, Elin[2] Fu, Feng[2] Lin, Lanying[2]

第一作者：Wang, Dong

通信作者：Lin, LY[1]

机构：[1]Northwestern Polytech Univ Culture & Heritage, Xian 710072, Shaanxi, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2022

卷号：56

期号：5

起止页码：1509-1525

外文期刊名：WOOD SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20223712716634);Scopus(收录号：2-s2.0-85137498881);WOS:【SCI-EXPANDED(收录号:WOS:000849157300006)】；

基金：This work was financially supported by the Nature Science Foundation of China (No.32101458), the Guangxi Natural Science Foundation (Grant No. 2018GXNSFBA281108) and the Fundamental Research Funds for the Central Universities (D5000210672).

语种：英文

外文关键词：Cellulose - Creep testing - Viscoelasticity - Wood

摘要：Thermal modification is a well-established method to improve the dimensional stability and the durability of wood for outdoor use. In this study, samples were thermally treated at 160-220 degrees C for 1 h. The differences of viscoelastic properties between the cell wall S-2 layer and compound middle lamella (CML) of thermally treated wood were investigated by creep compliance testing and dynamic modulus mapping of nanoindentation. The elastic parameters of the S-2 and CML, such as reduced modulus and storage modulus, decrease and then increase as the treatment temperature increases. By contrast, the loss moduli and loss factors of the two layers decrease steadily as the treatment temperature increases. In addition, the creep compliance results indicate that the S-2 layers of the untreated and treated samples exhibit greater elasticity than does the CML, but the rheological characteristics of the CML are more obvious. Finally, the loss modulus and loss factor of the S-2 layer are also larger than those of the CML. The changes of viscoelastic properties of cell walls of thermally treated wood are mainly related to hemicellulose degradation, the cross-linkage structure between cellulose and matrix breakage, and cellulose microfibrils arrangement.