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在293~393K温度范围内,分别采用一维红外光谱、二阶导数红外光谱和二维红外光谱测定硬脂酸亚甲基面内摇摆振动(ρCH2)。实验发现:在700~750cm-1范围内,硬脂酸ρCHα存在“第一特征谱带”和未见文献报道的“第二特征谱带”。并进一步研究了温度对于硬脂酸ρCH2红外吸收强度及变化顺序的影响。
In the temperature range of 293 ~ 393K, one-dimensional infrared spectroscopy, second-order derivative infrared spectroscopy and two-dimensional infrared spectroscopy were used to determine the in-plane oscillating vibration (ρCH2) of stearic acid. The experimental results show that there is “first characteristic band” and no “second characteristic band” reported in the literature for the range of 700-750 cm-1. The effect of temperature on infrared absorption intensity and sequence of ρCH2 stearic acid was further studied.