Electron Paramagnetic Resonance Measurements of Strain Induced Ozone Cracking in Rubber

[+] Author and Article Information
K. L. DeVries, E. R. Simonson

Mechanical Engineering, University of Utah, Salt Lake City, Utah

M. L. Williams

University of Utah, Salt Lake City, Utah

J. Basic Eng 91(4), 587-589 (Dec 01, 1969) (3 pages) doi:10.1115/1.3571193 History: Received January 13, 1969; Online November 03, 2011


An electron paramagnetic resonance (EPR) method for monitoring the rate of atomic bond rupture in rubber subjected to uniaxial tensile strain in an ozone environment is described. The free radicals so formed are found to be quite stable and present in large, easily detectable concentrations. The initial rate of bond rupture was found to be approximately proportional to ozone concentration at fixed strain. Below a prestrain of three percent, no effect of the ozone environment was detected; above this threshold, the rate of rupture increases with strain up to strains of approximately 20 percent. It appears that this EPR technique is very sensitive and can yield information not readily obtainable by more conventional techniques.

Copyright © 1969 by ASME
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