汽油机油分子结构及热变性研究
Study on Molecular Structure and Thermal Denaturation of Gasoline Engine Oil
于宏伟 1田晨阳 2李穆婵 2吉一帆 2韩一诺 2吴雨靓2
作者信息
- 1. 石家庄学院化工学院,石家庄 050035;河北省麻醉药技术创新中心,石家庄 050035
- 2. 石家庄学院化工学院,石家庄 050035
- 折叠
摘要
采用中红外(MIR)光谱研究了汽油机油(简称:机油)的分子结构.实验发现,机油分子结构的红外吸收模式主要包括:CH3基团不对称伸缩振动模式(vasCH3-机油)、CH3基团对称伸缩振动模式(vsCH3-机油)、CH2基团不对称伸缩振动模式(vasCH2-机油)、CH2基团对称伸缩振动模式(vsCH2-机油)、C=O基团伸缩振动模式(vC=O-机油)、CH3基团对称变角振动模式(δsCH3-机油)、CH2基团变角振动模式(δCH2-机油)和CH2基团面内摇摆振动模式(ρCH2-机油).进一步开展了机油分子结构变温MIR光谱研究.实验发现:随着测定温度的升高(303～523 K),机油分子主要官能团对应的红外吸收频率及强度均有明显的改变.最后采用二维MIR光谱进一步开展了机油分子结构热稳定性的研究.本项研究拓展了三级MIR光谱在重要的精细石油化工产品(机油)结构及热变性的研究范围.
Abstract
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.
关键词
机油/中红外光谱/变温中红外光谱/二维中红外光谱/结构/热变性Key words
engine oil/mid-infrared spectroscopy/variable temperature mid-infrared spectroscopy/two-dimensional mid-infrared spectroscopy/structure/thermal denaturation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据