Thermodynamic Properties of Natural Rubber and Isoprene
- 1 March 1966
- journal article
- Published by Rubber Division, ACS in Rubber Chemistry and Technology
- Vol. 39 (1) , 143-148
- https://doi.org/10.5254/1.3544826
Abstract
Using published specific heat data, the entropy, enthalpy, and Gibbs free energy of natural rubber (NR) have been calculated over the temperature range 0 to 320° K. The thermodynamic function Cp/T as a function of T calculated for NR exhibits a maximum at 50° K and another maximum at 210° K, which is associated with the glass transition. The number of classically vibrating units per repeating unit of NR is 6.61 at 300° K. These functions have also been calculated for isoprene over the temperature range 0 to 300° K. At 298.16° K the entropy of polymerization was found to be 24.00 cal mole−1deg−1 and the free energy of polymerization − 10.7 kcal/mole.Keywords
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