Cation sulfonate EPDM, effect

The composition and structure of the base EPDM and the sulfonate content of the metal sulfonate-containing EPDM exert substantial effects on the mechanical and flow properties of ionomers. The systems discussed to this point have all contained zinc sulfonate groups. In terms of melt flow the zinc cation is the cation of choice. The metal cation borne by... 

Figure 3. Effect of sulfonate content and EPDM on tensile strength at 25°C (metal cation zinc)...

Figure 7. Effect of cation and zinc stearate on water absorption (base polymer—CR-2504 sulfonate content—31 meq/100 g EPDM zinc stearate—90 meq/100 g EPDM)...

Recently there has been considerable work on metal-neutralized sulfonated elastomers (23,24,25). The effect of various monovalent and divalent cations on physical properties of sulfonated ethylene-propylene-diene monomers (EPDM s) has been investigated and large differences have been found in both melt-flow rates and tensile properties, depending on the cation used. 

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