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- W2085672906 abstract "A butadiene-styrene-4-vinylpyridine terpolymer was crosslinked by coordination of the pyridine side-groups with nickel chloride. Previous studies have shown that the complexes cluster together, although some complexes remain isolated, especially at low metal concentration. Thermoreversibility of the crosslinking is studied by stress relaxation and internal friction. Superposition of two relaxation mechanisms occurs; up to a temperature T ⋍ 20°C the shift factor follows the usual WLF equation. For higher temperatures log aT obeys an Arrhenius equation with an activation energy of 28 kcal. This secondary relaxation mechanism is attributed to exchange reactions between complexes of the clusters. This behaviour is similar to that of other polymers with microphase separation. Influence of the concentration is studied by internal friction. At low concentration breakdown of the modulus takes place in two steps corresponding to the onset of intermolecular bonding lability, first in isolated complexes and then in clustered complexes. At higher concentration clustered complexes are sufficiently numerous to prevent the first flow." @default.
- W2085672906 created "2016-06-24" @default.
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- W2085672906 date "1976-05-01" @default.
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- W2085672906 title "Ion-clustering and viscoelastic properties in poly(butadiene-styrene-4-vinylpyridine) crosslinked by nickel chloride" @default.
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- W2085672906 doi "https://doi.org/10.1016/0032-3861(76)90232-9" @default.
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