Limitations of the Tobolsky ‘Two Network’ Theory in Interpretation of Stress Relaxation Data in Rubbers

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Abstract
Viton B vulcanized with triethylenetetramine and containing ρ-phenylenediamine relaxes in air at 200° C more slowly than in the absence of the diamine. At 130° C both vulcanizates relax at the same rate, the phenylenediamine reacts to form new crosslinks at 200° C. These results suggest caution in applying the “two network” hypothesis to interpret stress relaxation.