Abstract
Historically, the first ESR experiments with mechanically produced free radicals have been made in the Ioffe-Institute in Leningrad in 1959 [1] with ground or milled polymers, the samples being investigated after completion of the fracture process. To elucidate the effect of structural or environmental parameters on the kinetics of stress-induced free radical formation it is necessary to study — by ESR — highly stressed chains during the loading process. As outlined in Chapter 5 a notable energy elastic straining of a chain can only be achieved if the chain cannot relieve stresses internally by a change of conformation or externally by slippage against the field exerting the uniaxial forces. Vice versa the mechanical scission of a chain must be taken as an indication that at the time of chain rupture axial stresses ψ equal to the chain strength ψ c had not only been reached but also maintained during the average lifetime period T c of the chain segment.
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von Schmeling, HH.KB. (1987). Phenomenology of Free Radical Formation and of Relevant Radical Reactions (Dependence on Strain, Time, and Sample Treatment). In: Polymer Fracture. Polymers, vol 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69628-2_7
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DOI: https://doi.org/10.1007/978-3-642-69628-2_7
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