Liquid (melt) heat capacities and heats of vaporization of oligomers of poly(hexamethylene sebacate)

1975 ◽  
Vol 15 (2) ◽  
pp. 73-78
Author(s):  
J. C. Phillips ◽  
L. A. Wall ◽  
Mary H. Aldridge
Keyword(s):  
Heat Capacities ◽  
Heats Of Vaporization

Heats of vaporization and gaseous heats of formation of some five- and six-membered ring alkenes

1979 ◽  
Vol 57 (17) ◽  
pp. 2302-2304 ◽  
Author(s):  
Richard Fuchs ◽  
L. Alan Peacock
Keyword(s):  
Gas Chromatography ◽  
Double Bond ◽  
Heat Capacities ◽  
Membered Ring ◽  
Heats Of Formation ◽  
Group Additivity ◽  
Liquid Heat ◽  
Heats Of Vaporization

The heats of vaporization of 1-methylcyclopentene, 3-methylcyclopentene, ethylidenecyclopentane, 1-ethylcyclopentene, methylenecyclohexane, allylcyclopentane, vinylcyclohexane, ethylidenecyclohexane, allylcyclohexane, 3,3-diethylpentane, 2,2,4,4-tetramethylpentane, and trans-2,2,5,5-tetramethyl-3-hexene have been measured by the gas chromatography – calorimetry method. These values have been combined with previously reported liquid heats of formation to give gaseous values of ΔHf. The results indicate that the internal double bond is favored by about 0.5 kcal over the exo in both 5- and 6-membered rings, but the endo–exo differences are much smaller than previously believed. Several of the liquid heat capacities that were measured were not well predicted by group additivity schemes.

Heats of vaporization and gaseous molar heat capacities of ethanol and the binary mixture of ethanol and benzene

1988 ◽  
Vol 66 (4) ◽  
pp. 783-790 ◽  
Author(s):  
Jin-Quan Dong ◽  
Rui-Sen Lin ◽  
Wen-Hsing Yen
Keyword(s):  
Binary Mixture ◽  
Entropy Change ◽  
Normal Pressure ◽  
Heat Capacities ◽  
Combined System ◽  
Pure Ethanol ◽  
Flow Calorimeter ◽  
Liquid Standard ◽  
Vaporization Calorimeter ◽  
Heats Of Vaporization

A combined system of the Newsham vaporization calorimeter and the Pitzer gaseous heat capacity flow calorimeter were reconstructed with modifications. Both calorimeters were calibrated with benzene, the liquid standard, and were found to be acceptable for measurements, with deviations of 0.4% and 0.9%, respectively. Heats of vaporization of pure ethanol under five pressures and binary mixtures of ethanol and benzene under normal pressure were determined. Gaseous molar heat capacities of pure ethanol under three pressures and of binary mixture of ethanol and benzene at two temperatures were also determined, with anomalies due to association noted. Association of ethanol molecules in the vapor phase was discussed and analyzed, with heats of association and entropy change of association calculated.

The Heats of Vaporization and Vapor Heat Capacities of Some Dimethylcyclohexanes1

1951 ◽  
Vol 73 (9) ◽  
pp. 4069-4071 ◽  
Author(s):  
J. P. McCullough ◽  
W. B. Person ◽  
Ralph Spitzer
Keyword(s):  
Heat Capacities ◽  
Heats Of Vaporization

Determination of heats of vaporization and some other thermodynamic quantities for four alkylcycloparaffins

1981 ◽  
Vol 46 (12) ◽  
pp. 2983-2988 ◽  
Author(s):  
Václav Svoboda ◽  
Vladimíra Charvátová ◽  
Vladimír Majer ◽  
Jiří Pick
Keyword(s):  
Temperature Dependence ◽  
Constant Pressure ◽  
Heat Capacities ◽  
Saturation Line ◽  
Thermodynamic Quantities ◽  
Cohesive Energies ◽  
Heats Of Vaporization

Heats of vaporization and some other related thermodynamic quantities were determined for the four alkylcycloparaffins: ethylcyclopentane, n-butylcyclopentane, ethylcyclohexane and tert-butylcyclohexane. The temperature dependence of heats of vaporization was measured and employed for calculating standard heats of vaporization, internal and cohesive energies of vaporization, entropies of vaporization, and differences between heat capacities of liquids and vapours at constant pressure and along the saturation line of vapours.

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