Temperature and pressure dependences of volumetric properties of two poly(propylene glycol) dimethyl ether lubricants

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• 作者：Olivia F ; i&#xf1 ; o ; Luis Lugo ; Maria J.P. Comu&#xf1 ; as ; Enriqueta R. L&#xf3 ; pez ; Josefa Ferná ; ndez
• 关键词：Density ; Pressure ; Isothermal compressibility ; Isobaric thermal expansivity ; Propylene oxide polymers ; Lubricant
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2010
• 出版时间：January 2010
• 年：2010
• 卷：42
• 期：1
• 页码：84-89
• 全文大小：286 K

文摘

The densities at high pressures of two dimethoxy end-capped poly(propylene glycols), CH₃–O–[CH₂–CH(CH₃)–O]_m–CH₃, with average molar masses higher than 1300 g · molp>−1p>, were measured in the range (0.1 to 60) MPa at five different temperatures from (298.15 to 398.15) K. The measurements were performed in a high-pressure vibrating tube densimeter. A correction factor, due to the viscosity of the sample, was applied to the experimental density values. The pressure–volume–temperature behavior of these lubricants was evaluated accurately over wide temperature and pressure ranges and correlated successfully with the empirical Tammann–Tait equation. The experimental data and the correlations were used to study the behavior and the influence of temperature and pressure on the isothermal compressibility, the isobaric thermal expansivity, and the internal pressure, as well as the effect of the polyether molecular structure on these properties.