Water exists in lignocellulosic materials throughout the whole process from the plant growth to raw materials processing and utilization. The fiber saturation point (FSP) is the inflection point of the physical and mechanical properties of lignocellulosic materials and has an important influence on their physical and mechanical properties. This paper investigates the FSP of Calamus simplicifolius by the low-field nuclear magnetic resonance (LF-NMR) method and two conventional methods including the saturated salt solution method and dynamic vapor sorption (DVS) method. The average FSP values determined by the LF-NMR method, the saturated salt solution method and the DVS method are 38.15%, 32.54% and 28.96%, respectively. The study showed that the FSP values determined by the LF-NMR method were higher than those determined by the two conventional methods. The two conventional methods are simple and cost-effective and are able to directly measure whether the rattan properties are changing with moisture content. From the thermodynamics standpoint, even within the ideal solution limit, free water is present at relative humidity (RH) of less than 100%. Therefore, extrapolation to 100% RH was not strictly correct. The amount of water in rattan in different states could be quantified by the LF-NMR method, and the FSP value was determined by the ratio of the measurements above and below the water melting point. Furthermore, the LF-NMR method is faster and non-destructive compared to the two conventional methods.

中文翻译：

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使用LF-NMR和两种常规方法测定藤（Calamus simplicifolius）的纤维饱和点

木质纤维素材料从植物生长到原料加工利用的整个过程中都存在水分。纤维饱和点（FSP）是木质纤维素材料物理力学性能的拐点，对其物理力学性能有重要影响。本文通过低场核磁共振(LF-NMR)法和饱和盐溶液法和动态蒸汽吸附法(DVS)两种常规方法研究了单叶菖蒲的FSP。LF-NMR法、饱和盐溶液法和DVS法测定的平均FSP值分别为38.15%、32.54%和28.96%。研究表明，LF-NMR 方法测定的 FSP 值高于两种常规方法测定的值。这两种常规方法简单、经济，能够直接测量藤条的特性是否随水分含量而变化。从热力学的角度来看，即使在理想的溶液极限内，在相对湿度 (RH) 小于 100% 时也会存在游离水。因此，外推到 100% RH 并不严格正确。不同状态的藤条中含水量可以通过LF-NMR法进行定量，FSP值由水熔点上下测量的比值确定。此外，与两种传统方法相比，LF-NMR 方法速度更快且无损。这两种常规方法简单、经济，能够直接测量藤条的特性是否随水分含量而变化。从热力学的角度来看，即使在理想的溶液极限内，在相对湿度 (RH) 小于 100% 时也会存在游离水。因此，外推到 100% RH 并不严格正确。不同状态的藤条中含水量可以通过LF-NMR法进行定量，FSP值由水熔点上下测量的比值确定。此外，与两种传统方法相比，LF-NMR 方法速度更快且无损。这两种常规方法简单且经济实惠，能够直接测量藤条特性是否随水分含量而变化。从热力学的角度来看，即使在理想的溶液极限内，在相对湿度 (RH) 小于 100% 时也会存在游离水。因此，外推到 100% RH 并不严格正确。不同状态的藤条中含水量可以通过LF-NMR法进行定量，FSP值由水熔点上下测量的比值确定。此外，与两种传统方法相比，LF-NMR 方法速度更快且无损。游离水在相对湿度 (RH) 小于 100% 时存在。因此，外推到 100% RH 并不严格正确。不同状态的藤条中含水量可以通过LF-NMR法进行定量，FSP值由水熔点上下测量的比值确定。此外，与两种传统方法相比，LF-NMR 方法速度更快且无损。游离水在相对湿度 (RH) 小于 100% 时存在。因此，外推到 100% RH 并不严格正确。不同状态的藤条中含水量可以通过LF-NMR法进行定量，FSP值由水熔点上下测量的比值确定。此外，与两种传统方法相比，LF-NMR 方法速度更快且无损。