Poly[oxy(dimethylsilylene)]
- Monomer Formula: C2H6OSi
- Monomer Molecular weight: 74.1539
- CAS Registry Number: 9016-00-6
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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°liquid | 154.6 | J/mol*K | N/A | Lebedev, Mukhina, et al., 1978 | |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 150.394 | J/mol*K | N/A | Varma-Nair, Wesson, et al., 1989 | amorphous phase |
| S°solid,1 bar | 135.769 | J/mol*K | N/A | Varma-Nair, Wesson, et al., 1989 |
Constant pressure heat capacity of liquid
| Cp,liquid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 154.6 | 298.15 | Lebedev, Mukhina, et al., 1978 | T = 8 to 332 K. |
Constant pressure heat capacity of solid
| Cp,solid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 117.775 | 298.15 | Varma-Nair, Wesson, et al., 1989 | amorphous phase; T = 0.10 to 550 K. Cp(liq) = 0.1215T + 81.55 J/mol*K (146 to 340 K). |
| 120.274 | 298.15 | Varma-Nair, Wesson, et al., 1989 | T = 0.10 to 550 K. Cp(c) = exp[0.0189189(lnT)3 - 0.402175(lnT)2 + 3.35144(lnT) - 4.78444] J/mol*K (5 to 146 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 |
|---|---|---|---|
| 2.750 | 219. | Varma-Nair, Wesson, et al., 1989 | 100% crystallinity. |
| 2.750 | 219. | Varma-Nair, Wesson, et al., 1989 | 100% crystallinity. |
| 4.540 | 246. | Lebedev, Mukhina, et al., 1978 | Degree of crystallinity is 67%. |
Entropy of fusion
| ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 18.6 | 246. | Lebedev, Mukhina, et al., 1978 | Degree |
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, Mukhina, et al., 1978
Lebedev, B.V.; Mukhina, N.N.; Kulagina, T.G.,
Thermodynamics of polydimethylsiloxane in the range 0-350°K,
Vysokomol. Soedin., 1978, A20, 1297-1303. [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
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid Cp,solid Constant pressure heat capacity of solid S°liquid Entropy of liquid at standard conditions S°solid,1 bar Entropy of solid at standard conditions (1 bar) ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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