核磁共振研究木材吸着过程中水分吸附机理

摘要

The changes of T2 of water absorbed to wood in an environment of constant temperature of 32 ℃ and relative humidity of 98％ was studied and used to reflect characteristics of water distribution and migration. The migration behavior of water molecules were used to explain the interactions between wood and water, and reveal the mechanism of water sorption at the microscopic level. The results of this study suggested that NMR is an effective tool to study the complex relationship between wood and water.%核磁共振方法以质子(H)为探针,为研究木材与水分的关系提供了一个新的视角.该文通过研究杨木在32℃恒温、相对湿度为98%恒湿环境下杨木吸着过程中质子的自旋-自旋弛豫时间T2的变化,进而来分析木材吸着过程中水分的分布与迁移特性.探测木材吸着过程中水分的迁移行为,为解释木材与水分的关系提供了一个有力的理论依据,同时从微观层面揭示木材吸着过程中水分的吸附机理,其水分吸附机理同样适用于食品等领域.实验结果证实核磁共振是揭示木材与水分的复杂关系的一个有效的手段.