Journal of Infrared Millimeter and Terahertz Waves ( IF 1.8 ) Pub Date : 2021-04-07 , DOI: 10.1007/s10762-021-00788-5 P Suma Sindhu , Nilanjan Mitra , Dipa Ghindani , Shriganesh S Prabhu
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.
中文翻译:
暴露于水的环氧树脂(DGEBA / TETA):确定水与环氧相互作用的光谱研究
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。