Hexamethyldisiloxane: chemical thermodynmic properties and internal rotation about the siloxane linkage
Thermodynamic, spectroscopic, and molecular structure information was used to show that internal rotation about an Si-O bond in hexamethyldisiloxane is free or nearly so. Thermodynamic functions for hexamethyldisiloxane in the ideal gas state (0 to 1500/sup 0/K) were calculated by methods of statistical mechanics. Experimental studies provided the following information: values of heat capacity for the solid (11/sup 0/K to the triple point), the liquid (triple point to 375/sup 0/K) and the vapor (363 to 500/sup 0/K); the triple point temperature; the heat of fusion; thermodynamic functions for the solid and liquid (0 to 375/sup 0/K); heat of vaporization (332 to 374/sup 0/K); parameters of the equation of state; and vapor pressure (309 to 412/sup 0/K). Thermodynamic functions also were calculated for the related substance tetramethylsilane.
- Research Organization:
- Bureau of Mines, Bartlesville, OK
- OSTI ID:
- 7319837
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 65; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ENERGY LEVELS
ENTHALPY
EQUATIONS
EQUATIONS OF STATE
EXCITED STATES
FUSION HEAT
MOLECULAR STRUCTURE
PHYSICAL PROPERTIES
ROTATIONAL STATES
SILOXANES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
VAPOR PRESSURE
VAPORIZATION HEAT