Corresponding states relations of dimethylsiloxanes: comparison of short and long chain linear- and cyclic-dimethylsiloxanes

• Published in: Fluid phase equilibria Vol. 128; no. 1; pp. 115 - 130
• Main Authors: Barbarín-Castillo, Juan-Manuel, McLure, Ian A
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1997; Elsevier Science
• Subjects: Chemical thermodynamics; Chemistry; Corresponding states relations; Cycloalkanes; Exact sciences and technology; Excess volumes of mixing; General and physical chemistry; Linear- and cyclic-dimethylsiloxanes; Mixtures; Reduction parameters; Tetramethylsilane; Theory; Thermodynamic properties; Corresponding states relations; Cycloalkanes; Tetramethylsilane; Theory; Excess volumes of mixing; Reduction parameters; Linear- and cyclic-dimethylsiloxanes; Dimethylsiloxane polymer; Hydrocarbon; Molar volume; Silicon Organic compounds; Organic siloxane; Excess parameter; Phenomenological model; Corresponding states principle; Alkane; Cyclohexane; Hexane; Thermodynamic properties; Monocyclic compound
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/S0378-3812(96)03132-9

A previous analysis of the pressure-volume-temperature behaviour showed that the linear dimethylsiloxanes conform to a phenomenological principle of corresponding states resembling but not identical to that of the normal alkanes. A similar analysis for tetramethylsilane-regarded as the first member of the dimethylsiloxane homologous series: two cyclic dimethylsiloxanes, octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane, and two polydimethylsiloxanes, one linear and one cyclic-confirms that they conform to a similar principle. The results are used to predict with fair success the excess volumes of mixing of a series of six related mixtures of cyclic substances-cyclohexane, cyclooctane and cyclodecane + either octamethylcyclotetrasiloxane or decamethylcyclopentasiloxane-and two linear + cyclic substance mixtures-either
n-hexane or decamethyltetrasiloxane + octamethylcyclotetrasiloxane.