Abstract
The effect of neutralization level on the dynamic mechanical properties and morphology of partly neutralized poly(ethyl acrylate-co-Na acrylate) EANa ionomers was investigated. The mechanical data of EANa ionomers were compared to those of polystyrene-based ionomers having higher T g but lower ion content than the EANa ionomers. It was found that at ca. 44 % neutralization, compared to ca. 50 % neutralization for styrene ionomers, the ionomers started to show cluster T g and ionic modulus. Thus, it was suggested that the 40–50 % neutralization level might be a starting point, at which the amorphous Na-neutralized ionomers, regardless of the matrix T g and acid content, behaved like bi-phasic materials. The SAXS study suggested that with increasing neutralization level the number of multiplets increased slightly but the number of ion pairs per multiplet increased systematically.
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