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| Study on Phase Transition of Myristic Acid by Two-Dimensional Infrared Spectroscopy |
| LI Zi-xuan1, LIU Hong2, ZHANG Yan-dong1, WU Xiao-jing1*, CHENG Long-jiu3 |
1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
2. Anhui Jinde Lubrication Technology Co., Ltd., Bengbu 233400, China
3. College of Chemistry & Chemical Engineering, Anhui University, Hefei 230601, China
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Abstract Fatty acids have been used in organic solid-liquid transformation materials due to their low cost, high latent heat of phase transition and good thermal stability. Although thermogravimetry (TG) and differential scanning calorimetry (DSC) for fatty acids can obtain thermodynamic data, it is difficult to analyze structural changes. Under the temperature perturbation, the two-dimensional infrared spectrum (2D-IR) signal will change instantaneously, and the structure change can be found by mathematical processing. In this paper, the infrared spectra of myristic acid were tested at 4 000～400 cm-1 and 30～100 ℃. The CO bond and O—H bond were analyzed by a two-dimensional moving window (MW2D) infrared spectrum, and it was found that the melting point measured by MW2D was the same as that measured by DSC. The results of the 2D-IR analysis showed that the overlapping absorption peaks were separated due to the improvement of resolution, and it was speculated that there was a transition from dimer to monomer configuration of myristic acid. There are three changes in the CO bond and O—H bond at temperature rise. Before the phase transition temperature, the absorption peak strength of CO remained unchanged, while the absorption peak strength of O—H gradually decreased, indicating that the dipole moment change of the O—H bond was more susceptible to temperature than the CO bond. During the phase transition, both of the absorption peak intensity decreased significantly, and the absorption peak intensity of the O—H decreased greatly. After the phase transition temperature, it may be that the intermolecular hydrogen bond is heated from strong to weak, and the electron cloud on O—H moves to CO, which leads to the increase of the CO absorption peak intensity and the decrease of the O—H absorption peak intensity. At the same time, combined with density functional theory, the inferences of 2D-IR have been verified, and there exists a transformation process from dimer to monomer configuration of myristic acid.
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Received: 2021-07-26
Accepted: 2021-10-25
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Corresponding Authors:
WU Xiao-jing
E-mail: wuxiaojing@ustc.edu
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