1,3-Butadiene, 2-methyl-, homopolymer
- Monomer Formula: C5H8
- Monomer Molecular weight: 68.1170
- CAS Registry Number: 9003-31-0
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: ISOPRENE RUBBER; Rubber
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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°solid,1 bar | 128.6 | J/mol*K | N/A | Warfield and Petree, 1965 | amorphous phase |
| S°solid,1 bar | 128.1 | J/mol*K | N/A | Bekkedahl and Matheson, 1935 | amorphous phase; From graphical integration of Cp data of crystal, entropy of fusion, and Cp data of amorphous above 284 K. |
Constant pressure heat capacity of solid
| Cp,solid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 128.3 | 298.15 | Warfield and Petree, 1965 | amorphous phase; T = 14 to 320 K. A reexamination of 35BER/MAT. |
| 122.9 | 280. | Bekkedahl and Matheson, 1935 | T = 15 to 280 K. Values per C5H8 unit. |
| 128.1 | 298.15 | Bekkedahl and Matheson, 1935 | amorphous phase; T = 14 to 320 K. Value per C5H8 unit. |
References
Go To: Top, Condensed phase thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Warfield and Petree, 1965
Warfield, R.W.; Petree, M.C.,
Thermodynamic properties of natural rubber and isoprene,
Die Makromol. Chemie, 1965, 84, 1-8. [all data]
Bekkedahl and Matheson, 1935
Bekkedahl, N.; Matheson, H.,
Heat capacity, entropy and free energy of rubber hydrocarbon,
J. Res., 1935, NBS 15, 503-515. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,solid Constant pressure heat capacity of solid S°solid,1 bar Entropy of solid at standard conditions (1 bar) - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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