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Thermoelasticity in Polymeric and Crystalline Solids from the Atomistic Viewpoint

  • J. H. Weiner

Abstract

On the macroscopic level, the difference in the thermoelastic behavior between crystalline solids and amorphous polymeric solids such as rubber is striking. While crystalline solids expand with increase in temperature, stretched rubber contracts upon heating. On the atomic level this difference may be traced to the greater degree of disorder in amorphous polymeric solids and consequently to the central role played by entropy in their mechanical behavior.

In this paper we present two simple linear chain atomistic models with prescribed nearest-neighbor interactions, one which represents, in highly idealized form, a crystalline solid and the second a long-chain molecule under tension. For these models, it is possible to calculate the thermoelastic relation by the application of the basic principles of classical equilibrium statistical mechanics. The model1 for the long-chain molecule is found to exhibit a transition in behavior, over a narrow range of temperature, from that expected for a harmonic crystal at low temperature levels, to that characteristic of a polymer at higher temperature levels.

Keywords

Thermal Stress Atomic Level Idealize Form Temperature Level Polymer Chemistry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    J. H. Weiner and M. R. Pear, “Computer Simulation of Conformational Transitions in an Idealized Polymer Model,” Macro-molecules Vol. 10 (1977) page 317.CrossRefGoogle Scholar
  2. 2.
    L. R. G. Treloar, The Physics of Rubber Elasticity, Third Edition, Clarendon Press, Oxford, 1975.Google Scholar
  3. 3.
    P. J. Flory, Principles of Polymer Chemistry, Cornell University Press, Ithaca, NY, 1953.Google Scholar
  4. 4.
    J. H. Weiner and M. R. Pear, Macromolecules, Vol. 10, 317–325, 1977.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • J. H. Weiner
    • 1
  1. 1.Division of EngineeringBrown UniversityProvidenceUSA

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