Thermoelasticity of Crosslinked Rubber Networks

  • M. Shen
  • T. Y. Chen
  • E. H. Cirlin
  • H. M. Gebhard


In recent publications we have demonstrated that by using a new equation, which is based on the temperature coefficient of shear modulus, the relative energy contribution (fu/f) to rubber elasticity can be shown to be independent of the applied strain. In this work, we have measured fu/f for natural rubber and polycis-1,4-butadiene at a series of degrees of crosslinking. Parallel equilibrium swelling studies in appropriate solvents were also made. It was found that fu/f is 0.17 for natural rubber and 0.10 for polycis-1,4-butadiene. These values are independent of the degree of crosslinking, except for the lowest degree of crosslinking. For the latter rubber networks, fu/f is 0.26 for natural rubber, and 0.34 for poly-cis-1,4-butadiene. Implications of these findings are discussed.


Shear Modulus Natural Rubber Network Chain Crosslinking Density Configurational Entropy 
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Copyright information

© Springer Science+Business Media New York 1971

Authors and Affiliations

  • M. Shen
    • 1
  • T. Y. Chen
    • 1
  • E. H. Cirlin
    • 2
  • H. M. Gebhard
    • 2
  1. 1.Department of Chemical EngineeringUniversity of CaliforniaBerkeleyUSA
  2. 2.Science CenterNorth American RockwellThousand OaksUSA

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