Epoxy resin, diglycidyl ether of bisphenol A (DGEBA) and triethylenetetramine (TETA), is known to be hygroscopic in nature, which eventually leads to mechanical performance degradation of the material. The long-standing debate on the nature of water-epoxy interaction has been investigated in this study with the help of terahertz spectroscopy, which is able to probe sub 100 cm^− 1 wavenumbers in which hydrogen bonds of water are active as well as infrared spectroscopy, which is able to probe 600–1000 cm^− 1 in which the libration motions of the water molecules are dominant. Based on observations, it can be demonstrated that both hydrogen-bonded water (with epoxy) and free interstitial water (hydrogen-bonded with itself) is present when the epoxy resin is exposed to normal or saline water. A schematic diagram is presented to demonstrate epoxy-water interactions.

环氧树脂，双酚A的二缩水甘油醚（DGEBA）和三亚乙基四胺（TETA）本质上具有吸湿性，最终导致材料的机械性能下降。在太赫兹光谱学的帮助下，这项研究对水-环氧相互作用的性质进行了长期的辩论，太赫兹光谱学能够探测低于100 cm ^-1的波数，其中水的氢键是活跃的，还具有红外光谱学，能够探测600–1000 cm ^{− 1}其中水分子的解放运动占主导地位。基于观察结果，可以证明当环氧树脂暴露于普通水或盐水中时，氢键合水（与环氧树脂）和自由间隙水（与氢键合）同时存在。给出了示意图以说明环氧-水的相互作用。