Study on Molecular Structure and Thermal Denaturation of Gasoline Engine Oil
The molecular structure of gasoline engine oil(abbreviation:engine oil)was studied by mid-infrared(MIR)spectroscopy.Experiments have found that the infrared absorption modes of engine oil molecular structure mainly include:CH3 group asymmetrical stretching vibration mode(vasCH3-engine oil),CH3 group symmetrical stretching vibration mode(vsCH3-engine oil),CH2 group asymmetrical stretching vibration mode(vasCH2-engine oil),CH2 group symmetrical stretching vibration mode(vsCH2-engine oil),C=O group stretching vibration mode(vC=o-engine oil),CH3 group symmetrical bending vibration mode(δs CH3-engine oil),CH2 group bending vibration mode(δCH2-engine oil)and CH2 group rocking vibration(ρCH2-engine oil)Further research on the variable temperature MIR spectroscopy of the molecular structure of engine oil was carried out.The experimental research found that as the measurement temperature increases(303-523 K),the infrared absorption frequency and intensity corresponding to the main functional groups of engine oil molecular structure changed significantly.Finally,two-dimensional MIR spectroscopy was used to further investigate the thermal stability of the engine oil molecular structure.It can be concluded that this research expands the scope of research on the structure and thermal denaturation of important fine petrochemical products(engine oil)using three-stage MIR spectroscopy.
engine oilmid-infrared spectroscopyvariable temperature mid-infrared spectroscopytwo-dimensional mid-infrared spectroscopystructurethermal denaturation
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