Abstract
Stress relaxation studies were made on poly(ethylene tetrasulfide) crosslinked during the polymerization reaction by the use of trifunctional organic chloride. At very low crosslink densities a certain amount of stress-relaxation due to chain slippage occurred. Over the middle range of crosslinking density stress-relaxation was due to tetrasulfide bond interchange exclusively, and these samples followed Maxwellian decay of stress. The specific rate constant for bond interchange ( k) is given by k = 5.86 × 10 12 (exp −25900/ RT). The value of the activation energy obtained is discussed in the light of the various energy values reported for the scission of sulfur-sulfur bonds in sulfur chains and rings.
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