Abstract
The unusual viscoelastic properties of metal sulphonate- (or metal carboxylate-) containing ionomers in semidilute solutions with non-polar solvents are reexamined. At fairly low polymer concentration of relatively short chains, these ionomer solutions show, besides the extremely high-viscosity behaviour studied in an earlier paper, an extensive plateau in the storage modulus and a cusp in the loss modulus, both characteristic of a highly entangled polymer melt or concentrated solution. We argue that, owing to the temporary crosslinks, the polymer chains are moving inside a network made up by the other crosslinked chains and hence undergo one-dimensional diffusional motions (reptation). The extensive plateau then arises from the disengagement of the chain from a deformed tube, as in the Doi-Edwards theory of melts and concentrationed solutions. We derive expressions for the storage and loss moduli which are in qualitative agreement with the experimental curves.
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