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
- Information on this page:
- Other data available:
- Options:
Phase change data
Go To: Top, 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 phase transition
ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
4.761 | 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 (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
16.8 | 284. | crystaline | amorphous | Bekkedahl and Matheson, 1935 | Corrected |
References
Go To: Top, Phase change data, Notes
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
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.