Abstract
The speeds of sound (u) have been measured at 298.15 K and atmospheric pressure, as a function of composition for seven binary liquid mixtures of propylamine (CH3CH2CH2NH2, PA) + ethylene glycol monomethyl ether (2-methoxyethenol, CH3(OC2H4)OH, EGMME); + diethylene glycol monomethyl ether [{2-(2-methoxyethoxy)ethanol}, CH3(OC2H4)2OH, Di-EGMME]; + triethylene glycol monomethyl ether [{2-(2-(2-methoxyethoxy)ethoxy) ethanol}, CH3(OC2H4)3OH, Tri-EGMME]; + diethylene glycol monoethyl ether [{2-(2-ethoxyethoxy)ethanol}, C2H5(OC2H4)2OH, Di-EGMEE]; + diethylene glycol monobutyl ether [{2-(2-butoxyethoxy) ethanol}, C4H9(OC2H4)2OH, Di-EGMBE]; + diethylene glycol diethyl ether [bis(2-ethoxyethyl)ether, C2H5 (OC2H4)2 OC2H5, DEGDEE]; and + diethylene glycol dibutyl ether [bis(2-butoxyethyl) ether, C4H9(OC2H4)2OC4 H9; DEGDBE] using a Nusonic velocimeter based on the sing–around technique. These values have been combined with densities derived from excess molar volumes to obtain estimates of the molar isentropic compressibility K S,m, and their excess values \(K_{\rm S,m}^{\rm E}\). The \(K_{\rm S,m}^{\rm E}\) values are shown to be negative for all mixtures over the entire composition range. The deviations u D of the speeds of sound from the values calculated for ideal mixtures have been obtained for all estimated values of mole fraction x1. The change of \(K_{\rm S,m}^{\rm E}\) and u D with composition and the number of –OC2H4 – units in the alkoxyethanol are discussed with a view to understand some of the molecular interactions present in alkoxyethanol – propylamine mixtures.Also, theoretical values of the molar isentropic compressibility of K S,m and of the speed of sound u D have been calculated using the Prigogine-Flory-Patterson (PFP) theory with the van der Waals (vdW) potential energy model, and the results have been compared with experimental values.
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Pal, A., Kumar, A. & Kumar, H. Speeds of Sound and Isentropic Compressibilities of n-Alkoxyethanols and Polyethers with Propylamine at 298.15 K. Int J Thermophys 27, 777–793 (2006). https://doi.org/10.1007/s10765-006-0047-0
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DOI: https://doi.org/10.1007/s10765-006-0047-0