Abstract
The high temperature stability, and the dynamic melt rheological properties of poly(ethylene-co-acrylic acid) (EAA), zinc salt of EAA, and sodium salt of EAA were evaluated in the molten state over broad ranges of shear rates and temperatures using ARES (Rheometrics). The master curves of G′ and G″ as a function of angular frequency (ω) were constructed for each material. The influence of ionic groups on the storage modulus (G′), loss modulus (G″), complex viscosity (η*), and flow activation energy (Ea) were analyzed. The results of EAA based ionomers are discussed with those of the ionomers based on poly(ethylene-co-methacrylic acid) (EMAA). The linear visco-elastic spectra, and flow activation energies of the two series of ionomers show differences.
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