Nuclear Magnetic Resonance (NMR) has been shown to be a useful technique to study the form and content of water in polymer composites. Composites using activated carbon fibres with phenolic resin have complex water absorption behaviour which would benefit from such investigation; however, the presence of the conductive fibres can make NMR problematic. In this study, single-sided NMR has been successfully used on such material by developing a method for sample-to-sample compensation for the effect of conductivity. Transverse relaxation curves showed water to be primarily in two states in the resin, corresponding to "bound" and "mobile" molecules. In addition, two much less bound states were identified in the composite, associated firstly with water adsorbed on to the fibre surface and secondly with clusters of water molecules moving more freely within the fibre pores.

中文翻译：

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使用单面核磁共振研究活性炭纤维/酚醛复合材料中的水分行为

核磁共振 (NMR) 已被证明是研究聚合物复合材料中水的形式和含量的有用技术。使用活性炭纤维和酚醛树脂的复合材料具有复杂的吸水行为，这将从此类研究中受益；然而，导电纤维的存在会使 NMR 出现问题。在这项研究中，通过开发一种对电导率影响进行样品到样品补偿的方法，单侧核磁共振已成功地用于此类材料。横向弛豫曲线显示水在树脂中主要处于两种状态，对应于“结合”和“移动”分子。此外，在复合材料中发现了两个束缚态少得多，