文献类型：期刊文献

英文题名：A study of pine resin in softwood by 1D and 2D time-domain NMR

作者：Gao Xin[1] Zhou Fan[1] Fu Zongying[1] Zhou Yongdong[1]

第一作者：高鑫

通信作者：Zhou, YD[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Dongxiaofu 1,Xiangshan Rd, Beijing 100091, Peoples R China

年份：2020

卷号：74

期号：9

起止页码：839-852

外文期刊名：HOLZFORSCHUNG

收录：;EI(收录号：20204409418896);Scopus(收录号：2-s2.0-85094162357);WOS:【SCI-EXPANDED(收录号:WOS:000565378100003)】；

基金：This study was supported by the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFY13132018QA001).

语种：英文

外文关键词：nuclear magnetic resonance; pine resin; relaxation time distributions; softwood; T-1-T-2 correlation relaxation

摘要：Time-domain nuclear magnetic resonance (TD-NMR) is widely used in the investigation of wood-water relationship. However, some ambiguities between the NMR signals and the components in wood remain unresolved, particularly the effect of pine resin on NMR signals. To clarify these ambiguities and increase the use of TD-NMR in wood research, different sample treatment methods were studied, including air-drying, low-temperature vacuum-drying, diethyl ether extraction and moisture isothermal adsorption. The corresponding one-dimensional (1D) T-1, T-2 and two-dimensional (2D) T-1, T-2 correlation relaxation time distributions of radiata pine and Douglas fir samples were investigated. The NMR signals accounted for "longer relaxation-time components" below the fiber saturation point (FSP), but overlaped in parts of the 1D relaxation time distributions making it difficult to distinguish between pine resin and moisture. The 2D T-1-T-2 correlation relaxation time distributions produced a better distinction between pine resin and bound water. This distinction established a quantitative relationship between pine resin, moisture and 2D NMR signal amplitudes.