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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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 phase transition
| ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 1.138 | 284. | crystaline | amorphous | Bekkedahl and Matheson, 1935 | Corrected for premelting, 255 to 284 K. Value per C5H8 unit. 'Fusion' actually transition to amorphous form. |
Entropy of phase transition
| ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 4.02 | 284. | crystaline | amorphous | Bekkedahl and Matheson, 1935 | Corrected |
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.
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, Phase change data, References
- Symbols used in this document:
ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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