Oxidative destruction of polymers under stress (original) (raw)

Polymer Degradation and Stability, 1984

Abstract

ABSTRACT The effect of stresses on the reactivity of macromolecules in chemical reactions has been studied. This effect may be a promoting, inhibiting or neutral effect. Experimental results are satisfactorily explained in terms of a transition complex approach and conformation analysis, by comparison of the energy changes in the initial and transition states under structural strain in a reacting fragment. Our concept, based on the reactivity change, has shed new light on the well-known ‘critical’ strain phenomenon in the ozone corrosion of rubbers. In the case of saturated polyolefins (polyethylene and polypropylene) it was found that the oxidation rate is proportional to exp σ, where σ is the stress, applied to uniaxially oriented films.

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