Abstract
With a view to isolating the secondary component from the complexed stress relaxation, a method originally proposed by Tobolsky and used for the study of the chemical stress relaxation in covalently bonded networks was applied to ion-containing polymers to which time-temperature superposition had been previously found inapplicable. A few examples were chosen from the two different groups of ionomers to demonstrate the applicability of this method. Although the secondary component in. one of styrene–sodium methacrylate copolymers (PS–NaMA) with 7.7 mol% of ions cannot be separated by this method at low temperatures, the secondary mechanism can be isolated at high temperatures. In other ionomers with more ions, the secondary mechanism is isolated by this method for the entire temperature ranges. The secondary relaxation is due to the yielding of the ionic structure, and these ionomers studied here approximately follow Maxwellian decay of stress. The activation energy obtained for the secondary mechanism of each ionomer, which ranges from 26 to 31 kcal mol−1, may correspond to the energy required to break the ionic interactions in the ionic clusters.
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Matsuura, H. Secondary Stress Relaxation Mechanism in Ion-Containing Polymers I. A New Analytical Method. Polym J 18, 1027–1035 (1986). https://doi.org/10.1295/polymj.18.1027
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DOI: https://doi.org/10.1295/polymj.18.1027