Poly(diethylsiloxane)

Condensed phase thermochemistry data

Go To: Top, Phase change data, References, Notes

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

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
S°liquid51.48cal/mol*KN/ALebedev, Kulagina, et al., 1984 
S°liquid51.48cal/mol*KN/AKulagina and Lebedev, 1982 
Quantity Value Units Method Reference Comment
S°solid,1 bar51.0748cal/mol*KN/AVarma-Nair, Wesson, et al., 1989amorphous phase
S°solid,1 bar50.8413cal/mol*KN/AVarma-Nair, Wesson, et al., 1989 

Constant pressure heat capacity of liquid

Cp,liquid (cal/mol*K) Temperature (K) Reference Comment
39.51298.15Lebedev, Kulagina, et al., 1984T = 13 to 300 K.
39.56298.15Kulagina and Lebedev, 1982T = 14 to 330 K.

Constant pressure heat capacity of solid

Cp,solid (cal/mol*K) Temperature (K) Reference Comment
39.4345298.15Varma-Nair, Wesson, et al., 1989amorphous phase; T = 0.10 to 550 K. Cp(liq) = 0.2365T + 93.75 J/mol*K (290 to 360 K).
39.4345298.15Varma-Nair, Wesson, et al., 1989T = 0.10 to 308.50 K.

Phase change data

Go To: Top, Condensed phase thermochemistry data, References, Notes

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

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Enthalpy of fusion

ΔfusH (kcal/mol) Temperature (K) Reference Comment
0.6874295.Kulagina and Lebedev, 1982Degree of crystallinity = 100%.

Entropy of fusion

ΔfusS (cal/mol*K) Temperature (K) Reference Comment
2.33295.Kulagina and Lebedev, 1982Degree

Enthalpy of phase transition

ΔHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.6501206.7crystaline, IIIcrystaline, IIVarma-Nair, Wesson, et al., 1989100% crystallinity/condis crystal.
0.4398282.7crystaline, IIcrystaline, IVarma-Nair, Wesson, et al., 1989Condis crystal/viscous crystal.
0.0552308.5crystaline, IliquidVarma-Nair, Wesson, et al., 1989 
0.6501206.7crystaline, IIIcrystaline, IIVarma-Nair, Wesson, et al., 1989100% crystallinity/condis crystal.
0.4398282.7crystaline, IIcrystaline, IVarma-Nair, Wesson, et al., 1989Condis crystal/viscous crystal.
0.0552308.5crystaline, IliquidVarma-Nair, Wesson, et al., 1989 
0.4947203.crystaline, IIcrystaline, ILebedev, Kulagina, et al., 1984Degree of crystallinity = 72%.
0.6874295.crystaline, IliquidLebedev, Kulagina, et al., 1984Degree of crystallinity = 100%.
0.4947203.crystaline, IIcrystaline, IKulagina and Lebedev, 1982Degree of crystallinity = 72%.

Entropy of phase transition

ΔStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
2.44203.crystaline, IIcrystaline, ILebedev, Kulagina, et al., 1984Degree
2.33295.crystaline, IliquidLebedev, Kulagina, et al., 1984Degree
2.44203.crystaline, IIcrystaline, IKulagina and Lebedev, 1982Degree

References

Go To: Top, Condensed phase thermochemistry data, Phase change data, Notes

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

Lebedev, Kulagina, et al., 1984
Lebedev, B.V.; Kulagina, T.G.; Svistunov, V.S.; Papkov, V.S.; Zhdanov, A.A., Calorimetric study of 1,1,3,3,5,5-hexaethylcyclotrisiloxane and polydiethysiloxane and the process of polymerization of 1,1,3,3,5,5-hexaethylcyclotrisiloxane in the range 13-330 K, Vysokomol. Soedin., 1984, A26, 2476-2482. [all data]

Kulagina and Lebedev, 1982
Kulagina, T.G.; Lebedev, B.V., Thermodynamics of 2,2,4,4,6,6-hexaethylcyclotrisiloxane, its polymerization, and the resulting poly(diethylsiloxane) in the 0-330 K range, 1982, Termodin. [all data]

Varma-Nair, Wesson, et al., 1989
Varma-Nair, M.; Wesson, J.P.; Wunderlich, B., The thermal properties of polysiloxanes poly(dimethyl siloxane) and poly(diethyl siloxane), J. Therm. Anal., 1989, 35(6), 1913-1939. [all data]

Notes

Go To: Top, Condensed phase thermochemistry data, Phase change data, References