文献类型：会议论文

英文题名：Study on the Moisture Distribution Within the Wood Treated with Microwave

作者：Yu, Jianfang[1] Guo, Jilong[2] Nan, Jingya[3] Sun, Binghu[1]

第一作者：Yu, Jianfang

通信作者：Yu, JF[1]

机构：[1]Inner Mongolia Agr Univ, Coll Mat Sci & Art Design, Hohhot, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing, Peoples R China

会议论文集：International Conference on Materials Science and Computing Science (MSCS 2011)

会议日期：AUG 13-14, 2011

会议地点：Wuhan, PEOPLES R CHINA

语种：英文

外文关键词：Microwave; Nuclear Magnetic Resonance; Moisture Migration

年份：2011

摘要：In this paper, Siberian elm (Ulmus pumila L) which was regarded as our research object was measured with the technology of Nuclear Magnetic Resonance (NMR) before and after being treated with microwave at different periods of time. By comparing the spin - spin relaxation time of hydrogen nuclear (T2) which can reflect the mobility of water molecules, the states and changes of the moisture distribution within the wood in the process of microwave treatment have been analyzed. The results indicate that in the initial stage of drying, the degree of the decline in bound water is greater than that in free water, for there may be a process of the transformation from bound water to free water; With the drying going on, the movement and expulsion mainly happen to free water above the fiber saturation point (FSP); In the later stage of drying, when the moisture content decreases near the FSP, bound water has also begun moving significantly on the expulsion of plenty of free water. In the final stage of drying, the decrease of hydrogen bonds in water molecules resulting from a plentiful reduction in free water, as well as the increased permeability within the wood caused by the microwave drying makes the relaxation time of free water to rise up.