利用核磁共振技术探究油松的纤维饱和点

Study on fiber saturation point of Pinus tabulaeformis by NMR

以油松为研究对象,利用核磁共振技术(NMR)探究油松木材的纤维饱和点。测定了油松在干燥过程中的横向弛豫时间T2,通过对横向弛豫时间T2图谱分析与木材干燥过程中几个测点所得含水率对比可知:油松的含水率与横向弛豫时间T2总积分面积呈高度线性关系。在含水率高于30%的干燥阶段,结合水T21的积分面积基本不变,自由水T22、T23的积分面积之和成比例下降;在含水率低于30%的干燥阶段,结合水T21积分面积成比例下降,自由水T22、T23积分面积之和继续下降,但下降速率逐渐减缓。由此,可以推断油松的纤维饱和点为30%,该结论符合木材学理论,表明NMR技术可以作为研究木材纤维饱和点的新途径。

Taking Pinus tabulaeformis as the research object, the fiber saturation point of Pinus tabulaeformis wood was studied by nuclear magnetic resonance（NMR）. The transverse relaxation time（T2） of Pinus tabulaeformis in drying process was determined. By comparing the T2 analysis of transverse relaxation time and moisture content in several drying points during the drying process, Obtaning the moisture content of Pinus tabulaeformis was high linearly related to the total integral area of T2 transverse relaxation time. In the drying stage over the water content of 30%, combined with the integral area of water T21 basically unchanged, the integral area of free water, T22 T23 is a proportional decrease in the drying stage; the moisture content is below 30%, the water T21 integral area is proportional decrease, the free water T22, T23 integral area continued to decline, but the decline rate slowed down gradually. Therefore, it can be inferred that the fiber saturation point of Pinus tabulaeformis is 30%. It shows that NMR technology can be used as a new way to study the saturation point of wood fiber.