Effect of oxyethylene groups on the behaviour of thermodynamic properties of pyrrolidin-2-one and poly(ethylene glycols)

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• 作者：Mehta ; S.K. ; Ram ; Ganga ; Sharma ; A.K.
• 关键词：Ultrasonic speed ; Excess volume ; Pyrrolidin-2-one ; Poly(ethylene glycol)s
• 刊名：Fluid Phase Equilibria
• 出版年：2004
• 期刊代码：32_03783812
• 类别：ce
• 出版时间：June 30, 2004
• 卷：220
• 期：2
• 页码：153-160
• 文件大小：141 K

摘要

Dilatometric measurements of excess volume V^E and ultrasonic speed u have been carried out for mixtures of mono-, di-, tri- and tetra(ethylene glycol)s in pyrrolidin-2-one (PY) over the whole mole fraction range at 303.15K. In the mixture of PY and monoethylene glycol, the V^E is positive except for slight negative variation at the high mole fraction of PY. The other three mixtures PY+di-, + tri- and + tetra(ethylene glycol)s show negative V^E over the entire composition range in the order di-<tri-<tetra-. There is a decrease in the values of ultrasonic speed u with increase in the mole fraction of PY in the case of monoethylene glycol while for other three systems u rises. From these measurements, partial molar quantities V_i^E and K_S,i^E have been calculated and analysed. Estimates of isentropic molar quantity K_S equal to −(∂V/∂p)_S and its excess counterpart K_S^E have also been computed. The K_S^E is positive for mono-, and negative for all the other mixtures over the whole composition range.