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Disiloxane, hexamethyl-

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Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil373. ± 2.KAVGN/AAverage of 7 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple204.93KN/AScott, Messerly, et al., 1961Uncertainty assigned by TRC = 0.02 K; TRC
Quantity Value Units Method Reference Comment
Tc518.7KN/AMcLure and Dickinson, 1976Uncertainty assigned by TRC = 0.51 K; TRC
Quantity Value Units Method Reference Comment
Pc19.25barN/AMcLure and Dickinson, 1976Uncertainty assigned by TRC = 0.10 bar; for sample see E.Dickinson and I.A.McClure, 1974-234; TRC

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
36.9315.EBFlaningam, 1986Based on data from 300. - 383. K.; AC
33.1327.N/ADitsent, Skorokhodov, et al., 1971Based on data from 293. - 361. K.; AC
36.324.EBScott, Messerly, et al., 1961, 2Based on data from 309. - 411. K.; AC
34.6 ± 0.1332.CScott, Messerly, et al., 1961, 2AC
33.1 ± 0.1351.CScott, Messerly, et al., 1961, 2AC
31.3 ± 0.1373.CScott, Messerly, et al., 1961, 2AC

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
309.4 - 411.563.901991203.916-64.673Scott, Messerly, et al., 1961, 2Coefficents calculated by NIST from author's data.

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
11.920204.93Dzhafarov and Kuliev, 1986DH
11.9219204.93Scott, Messerly, et al., 1961, 2DH
11.92204.9Domalski and Hearing, 1996AC

Entropy of fusion

DeltafusS (J/mol*K) Temperature (K) Reference Comment
58.18204.93Scott, Messerly, et al., 1961, 2DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


References

Go To: Top, Phase change data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Scott, Messerly, et al., 1961
Scott, D.W.; Messerly, J.F.; Todd, S.S.; Guthrie, G.B.; Hossenlopp, I.A.; Moore, R.T.; Osborn, A.G.; Berg, W.T.; McCullough, J.P., Hexamethyldisiloxane: chemical thermodynamic properties and internal rotation about the siloxane linkage, J. Phys. Chem., 1961, 65, 1320-6. [all data]

McLure and Dickinson, 1976
McLure, I.A.; Dickinson, E., Vapor pressure of hexamethyldisiloxane near its critical point: corresponding-states principle for dimethylsiloxanes, J. Chem. Thermodyn., 1976, 8, 93-5. [all data]

Flaningam, 1986
Flaningam, Ora L., Vapor pressures of poly(dimethylsiloxane) oligomers, J. Chem. Eng. Data, 1986, 31, 3, 266-272, https://doi.org/10.1021/je00045a002 . [all data]

Ditsent, Skorokhodov, et al., 1971
Ditsent, V.E.; Skorokhodov, I.I.; Terent'eva, N.A.; Zolotareva, M.N., Russ. J. Phys. Chem., 1971, 45, 6, 901. [all data]

Scott, Messerly, et al., 1961, 2
Scott, D.W.; Messerly, J.F.; Todd, S.S.; Guthrie, G.B.; Hossenlopp, I.A.; Moore, R.T.; Osborn, A.; Berg, W.T.; McCullough, J.P., Hexamethyldisiloxane: chemical thermodynamic properties and internal rotation about the siloxane linkage, J. Phys. Chem., 1961, 65, 1320-1326. [all data]

Dzhafarov and Kuliev, 1986
Dzhafarov, O.I.; Kuliev, A.M., Heat capacity and thermodynamic properties of disiloxanes, Dokl. Akad. Nauk. Azerb., 1986, SSR 42, 56-59. [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]


Notes

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