THERMODYNAMIC PROPERTIES OF NATURAL RUBBER AND ISOPRENE,

Abstract

Using published specific heat data, the entropy, enthalpy, and Gibbs free energy of natural rubber (NR) was calculated over the temperature range 0 to 320K. These functions were also calculated for isoprene over the temperature range 0 to 300K. At 298.16K the entropy of polymerization was found to be 24.00 cal/mole deg. and the free energy of polymerization 10.7 Kcal/mole. The thermodynamic function Cp/T versus T calculated for NB exhibits a maximum at 50K and another maximum at 210K which is associated with the glass transition. The number of classically vibrating units per repeating unit of NR is 6.61 at 300K. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 18, 1964
Accession Number
AD0604549

Entities

People

  • M. C. Petree
  • R. W. Warfield

Organizations

  • Naval Ordnance Laboratory

Tags

DTIC Thesaurus Topics

  • Energy
  • Enthalpy
  • Free Energy
  • Isoprene
  • Natural Rubber
  • Physical Properties
  • Polymerization
  • Rubber
  • Specific Heat
  • Thermodynamic Properties
  • Transitions

Fields of Study

  • Chemistry
  • Materials science

Readers

  • Calculus or Mathematical Analysis
  • Quantum Chemistry
  • Thermal Physics or Thermal Science.