Ethylene ionomers temperature dependence

Fig. 3. The temperature dependence of tan <5 at a frequency of 1 Hz for the zinc salt of ethylene ionomers. These ethylene ionomers are copoly(ethylene-methacrylic acid) with an acid content of 0.054 and various degrees of neutralization (E-0.054MAA-xZn x is the degree of neutralization).

For partially crystalline ionomers, such as those based on copolymers of ethylene and methacrylic acid, even time or aging at room temperature can have an effect on mechanical properties. For example, upon aging at 23°C, the modulus of the acid form of the copolymer increased 28%, while in the ionomer form, the increase ranged up to 130%, with the specific gain in modulus depending on the degree of conversion and on the counterion that was present [17]. 

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