AbstractThe applicability of the formulaf(t) =n(t)RT(α − α−2) suggested by Tobolsky as the basis of chemorheology has been discussed. In this expression,f(t) is the stress afterthours,n(t) is the crosslinking density (mole/cc) afterthours,Ris the gas constant,Tis the absolute temperature, and α is the extension ratio. We have discussed the applicability of this formula, in another words, whether the degraded stressf(t) calculated from this formula would be consistent with the initial stressft(0) of other polymer if the degraded crosslinking density valuesn(t) are equal to those ofnt(0), the initial density valuesn(0) of other polymer. Natural rubber vulcanizates and SBR vulcanizates were used as samples in these experiments. Assumingn(t) = σ(t)n(0), α(t′) = 1, the applicability of the above formula was recognized from our experiment
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