The density, viscosity, speed of sound, excess properties of binary mixtures of linear polydimethylsiloxane and various alkanes at temperatures in the range (288.15–328.15) K. (October 2021)

• Record Type: Journal Article
• Authors: Zhang, Weiwei; Luan, Wengeng; Dong, Hong; Wu, Chuan; Qu, Zhirong
• Is Part Of: Journal of chemical thermodynamics. Volume 161(2021)
• Publication Date: 2021-10
• Subjects: Linear polydimethylsiloxane -- Density -- Viscosity -- Speed of sound -- Derived properties; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2021.106537
• Languages: English
• ISSNs: 0021-9614

Abstract

Graphical abstract: Highlights: Density, viscosity and speed of sound of binary mixtures were measured. The measurements cover the temperature range of (288.15–328.15) K at atmospheric pressure. As the carbon chain increases, the steric hindrance of alkane molecules increases. With an increase in carbon chain length, the V m E, η E and Δ G decreased and κ E s, m increased. Abstract: This article describes the binary system composed of linear polydimethylsiloxane (PDMS) and diesel fuel main components n-decane, n-dodecane, n-tridecane and n-tetradecane at atmospheric pressure, and the density, viscosity and speed of sound were measured at 288.15 K, 298.15 K, 308.15 K, 318.15 K and 328.15 K, respectively. Their excess molar volume ( V m E ), excess viscosity ( η E ), excess molar Gibbs free energy (Δ G E m ), molar isobaric thermal expansion ( E P, m ) and excess molar isentropic compressibility ( κ E s, m ) were calculated. The influence of the intermolecular force, steric hindrance, molecular stacking and other factors on the excessive properties of the binary system solution was discussed. The results indicate that with an increase in carbon chain length, the excess molar volume, excess viscosity, molar isobaric thermal expansion and excess molar isentropic compressibility increased and excess molar Gibbs free energy decreased, which probably ascribe to the increase in steric effect and the stronger interactions between homo-molecular than those of hetero-molecular interactions between PDMS and long-chain alkane molecules.