Abstract
Abstract The stress relaxation of a low‐crystallinity type thermoplastic elastomer (TPR), 1,2‐syndiotactic polybutadiene, was studied. By using the continuous and intermittent stress relaxation method, the Co60 r‐ray irradiated samples were tested from 30°C to 106°C under air, nitrogen or oxygen atmosphere. The relative stress relaxation curve of this low crystallinity kind of elastomer can be expressed by two Maxwellian decay terms. f(t)/f(0)=o 1 exp (‐k 1 t) + o 2 exp (‐k 2 t) Since there are only a few C=C double bonds in the polymer main chain, the oxidation of C=C in the side chain does not influence the strength of the stress relaxation. Thus the chemical relaxation can be ignored in this kind of thermoplastic elastomer. These two Maxwellian terms are both of physical stress relaxation, namely, flexible chain slippage and crystalline domain disintegration (breaking), respectively:
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