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高压下磷酸酯类离子液体1-(O,O-二乙基膦酰丙基)-3-辛基咪唑六氟磷酸盐的拉曼光谱和粘度研究
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Abstract:
磷酸酯类离子液体1-(O,O-二乙基膦酰丙基)-3-辛基咪唑六氟磷酸盐([DPPOIM][PF6])是一种新型的润滑剂材料，本文利用拉曼光谱和自制的高压粘度测量装置对其在高压的结构、相变及粘度进行了研究。基于高压拉曼光谱结果和红宝石荧光峰峰位的分析，推断[DPPOIM][PF6]的玻璃化转变压力约为2.9 GPa，[DPPOIM][PF6]在该压力点由液态转变为玻璃态。采用自制的粘度测量装置测得[DPPOIM][PF6]高压下的粘度数据，并将粘度与压力的关系进行线性拟合，获得[DPPOIM][PF6]的玻璃化转变压力点为2.6 GPa，这与分析红宝石荧光峰获得的结果基本一致。通过研究磷酸酯类离子液体润滑剂在高压下的拉曼光谱和粘度，对于拓宽其在高压等极端条件下的应用具有非常重要的实用价值。
Phosphateionic liquid 1-(O,O-diethylphosphonyl-n-propyl)-3-octylimidazolium hexafluorophosphate ([DPPOIM][PF6]) is a novel lubricant. The structure, phase transition, and viscosity of [DPPOIM][PF6] under high pressure were studied by Raman spectroscopy and a homemade high-pressure viscosity device. By analyzing the peak positions of Raman spectra and ruby fluorescence peaks, it could be inferred that [DPPOIM][PF6] underwent a glass transition near 2.9 GPa, from a liquid state to a glassy state. The viscosity data of [DPPOIM][PF6] under high pressure were measured using a homemade viscosity device, and the relationship between viscosity and pressure was linearly fitted to obtain the glass transition pressure of 2.6 GPa, which was basically consistent with the glass transition pressure obtained by analyzing Raman spectra and ruby fluorescence peaks for [DPPOIM][PF6]. The study of the Raman spectra and viscosity of phosphate ionic liquid under high pressure is of great practical significance for expanding their applications under extreme conditions such as high pressure.
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