Poly(diethylsiloxane)

Condensed phase thermochemistry 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 by: Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
S°liquid215.4J/mol*KN/ALebedev, Kulagina, et al., 1984 
S°liquid215.4J/mol*KN/AKulagina and Lebedev, 1982 
Quantity Value Units Method Reference Comment
S°solid,1 bar213.697J/mol*KN/AVarma-Nair, Wesson, et al., 1989amorphous phase
S°solid,1 bar212.720J/mol*KN/AVarma-Nair, Wesson, et al., 1989 

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
165.3298.15Lebedev, Kulagina, et al., 1984T = 13 to 300 K.
165.5298.15Kulagina and Lebedev, 1982T = 14 to 330 K.

Constant pressure heat capacity of solid

Cp,solid (J/mol*K) Temperature (K) Reference Comment
164.994298.15Varma-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).
164.994298.15Varma-Nair, Wesson, et al., 1989T = 0.10 to 308.50 K.

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 by: Eugene S. Domalski and Elizabeth D. Hearing

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Reference Comment
2.876295.Kulagina and Lebedev, 1982Degree of crystallinity = 100%.

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment
9.75295.Kulagina and Lebedev, 1982Degree

Enthalpy of phase transition

ΔHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
2.720206.7crystaline, IIIcrystaline, IIVarma-Nair, Wesson, et al., 1989100% crystallinity/condis crystal.
1.840282.7crystaline, IIcrystaline, IVarma-Nair, Wesson, et al., 1989Condis crystal/viscous crystal.
0.231308.5crystaline, IliquidVarma-Nair, Wesson, et al., 1989 
2.720206.7crystaline, IIIcrystaline, IIVarma-Nair, Wesson, et al., 1989100% crystallinity/condis crystal.
1.840282.7crystaline, IIcrystaline, IVarma-Nair, Wesson, et al., 1989Condis crystal/viscous crystal.
0.231308.5crystaline, IliquidVarma-Nair, Wesson, et al., 1989 
2.070203.crystaline, IIcrystaline, ILebedev, Kulagina, et al., 1984Degree of crystallinity = 72%.
2.876295.crystaline, IliquidLebedev, Kulagina, et al., 1984Degree of crystallinity = 100%.
2.070203.crystaline, IIcrystaline, IKulagina and Lebedev, 1982Degree of crystallinity = 72%.

Entropy of phase transition

ΔStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
10.2203.crystaline, IIcrystaline, ILebedev, Kulagina, et al., 1984Degree
9.75295.crystaline, IliquidLebedev, Kulagina, et al., 1984Degree
10.2203.crystaline, IIcrystaline, IKulagina and Lebedev, 1982Degree

References

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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

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