## 3 Results and Discussion
### Influence of Ionic Coagents on Reinforcement
However, the effect of post-curing is negligible, indicating good thermal stability for 24 h at 150 \({}^{\circ}\)C.  
for EPDM-TRIM is negligible, the ionic coagents significantly affect the elastic recovery at 100 \({}^{\circ}\)C. This phenomenon is attributed to the dissociation of the Zn\({}^{2+}\) bonds at elevated temperatures [31]. \begin{table}
\begin{tabular}{l c c c c} \hline \hline \multirow{2}{*}{**Sample**} & **Tan \$ & **Hardness** & **CS@RT** & **CS@100 \({}^{\circ}\)C** \\  & **(-)** & **(Shore A)** & **(\%)** & **(\%)** \\ \hline EPDM-7.5 ZDMA-0 h & - & 58 \(\pm\) 1.2 & 17 \(\pm\) 0.5 & 32 \(\pm\) 1.0 \\ EPDM-7.5 ZDMA-24 h & 0.63 & 60 \(\pm\) 0.6 & - & - \\ EPDM-15 ZDMA-0 h & - & 62 \(\pm\) 1.5 & 24 \(\pm\) 0.7 & 47 \(\pm\) 0.6 \\ EPDM-15 ZDMA-24 h & 0.60 & 62 \(\pm\) 0.6 & - & - \\ EPDM-7.5 ZDMA-0 h & - & 60 \(\pm\) 1.2 & 26 \(\pm\) 0.8 & 37 \(\pm\) 1.2 \\ EPDM-7.5 ZDA-24 h & 0.61 & 58 \(\pm\) 0.6 & - & - \\ EPDM-15 ZDA-0 h & - & 60 \(\pm\) 0.6 & 25 \(\pm\) 0.9 & 52 \(\pm\) 1.9 \\ EPDM-15 ZDA-24 h & 0.57 & 59 \(\pm\) 1.2 & - & - \\ EPDM-TRIM-0 h & - & 56 \(\pm\) 1.0 & 24 \(\pm\) 0.6 & 26 \(\pm\) 0.9 \\ EPDM-TRIM-24 h & 0.63 & 57 \(\pm\) 0.6 & - & - \\ PF-ZDA-0 h & - & 72 \(\pm\) 0.6 & 34 \(\pm\) 0.6 & 58 \(\pm\) 1.8 \\ PF-ZDA-24 h & 0.50 & 72 \(\pm\) 0.6 & - & - \\ PF-ZDMA-0 h & - & 71 \(\pm\) 0.6 & 33 \(\pm\) 0.6 & 54 \(\pm\) 1.4 \\ PF-TDM-24 h & 0.52 & 71 \(\pm\) 1.2 & - & - \\ PF-TRIM-0 h & - & 65 \(\pm\) 0.6 & 19 \(\pm\) 0.9 & 32 \(\pm\) 2.1 \\ PF-TRIM-24 h & 0.49 & 66 \(\pm\) 0.5 & - & - \\ PF-7 PO-0 h & - & 63 \(\pm\) 0.6 & 25 \(\pm\) 0.4 & 45 \(\pm\) 1.2 \\ PF-7 PO-24 h & 0.48 & 68 \(\pm\) 1.2 & - & - \\ PF-5 PO-0 h & - & 63 \(\pm\) 1.0 & 22 \(\pm\) 0.6 & 37 \(\pm\) 1.7 \\ PF-5 PO-24 h & 0.50 & 68 \(\pm\) 1.2 & - & - \\ Belt-Ref-0 h & - & 63 \(\pm\) 0.6 & 14 \(\pm\) 0.3 & 16 \(\pm\) 0.4 \\ Belt-Ref-24 h & 0.54 & 62 \(\pm\) 0.6 & - & - \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Tan \(\$\), Shore A haradness, and compression set properties of reinforced EPDM vulcanizates. \begin{table}
\begin{tabular}{l c c c c} \hline \hline \multirow{2}{*}{**Sample**} & **TS** & \(\epsilon_{\bf b}\) & \(\sigma_{\bf 100}\) & \(\sigma_{\bf 300}\) & **Tear** \\  & **(MPa)** & **(\%)** & **(MPa)** & **(MPa)** & **(N/mm)** \\ \hline EPDM\_7.5 ZDMA-0 h & 25.4 \(\pm\) 1.1 & 617 \(\pm\) 16.7 & 2.6 \(\pm\) 0.1 & 8.5 \(\pm\) 0.2 & 16 \(\pm\) 1.0 \\ EPDM-7.5 ZDMA-24 h & 24.5 \(\pm\) 0.3 & 587 \(\pm\) 19 & 2.7 \(\pm\) 0.1 & 8.8 \(\pm\) 0.1 & 17 \(\pm\) 0.4 \\ EPDM-15 ZDMA-0 h & 16.0 \(\pm\) 0.3 & 617 \(\pm\) 16 & 2.4 \(\pm\) 0.1 & 6.4 \(\pm\) 0.1 & 26 \(\pm\) 0.2 \\ EPDM-15 ZDMA-24 h & 15.8 \(\pm\) 0.4 & 619 \(\pm\) 11 & 2.5 \(\pm\) 0.1 & 6.5 \(\pm\) 0.2 & 28 \(\pm\) 0.1 \\ EPDM-7.5 ZDMA-0 h & 22.0 \(\pm\) 0.8 & 492 \(\pm\) 8 & 3.0 \(\pm\) 0.1 & 10.7 \(\pm\) 0.2 & 14 \(\pm\) 0.8 \\ EPDM-7.5 ZDMA-24 h & 22.4 \(\pm\) 1.2 & 476 \(\pm\) 9 & 3.2 \(\pm\) 0.1 & 11.5 \(\pm\) 0.2 & 15 \(\pm\) 1.2 \\ EPDM-15 ZDMA-0 h & 23.2 \(\pm\) 1.2 & 560 \(\pm\) 15 & 3.2 \(\pm\) 0.1 & 10.2 \(\pm\) 0.3 & 19 \(\pm\) 1.5 \\ EPDM-15 ZDA-24 h & 21.6 \(\pm\) 1.2 & 535 \(\pm\) 13 & 3.2 \(\pm\) 0.1 & 10.2 \(\pm\) 0.3 & 18 \(\pm\) 0.3 \\ EPDM-TRIM-0 h & 16.3 \(\pm\) 0.7 & 452 \(\pm\) 9 & 2.4 \(\pm\) 0.1 & 8.3 \(\pm\) 0.1 & 12 \(\pm\) 0.3 \\ EPDM-TRIM-24 h & 16.6 \(\pm\) 0.5 & 459 \(\pm\) 9 & 2.5 \(\pm\) 0.1 & 8.5 \(\pm\) 0.2 & 10 \(\pm\) 0.7 \\ PF-ZDA-0 h & 12.9 \(\pm\) 0.7 & 742 \(\pm\) 14 & 3.1 \(\pm\) 0.1 & 6.4 \(\pm\) 0.1 & 22 \(\pm\) 0.4 \\ PF-ZDA-24 h & 11.7 \(\pm\) 0.9 & 715 \(\pm\) 24 & 2.8 \(\pm\) 0.1 & 6.5 \(\pm\) 0.3 & 22 \(\pm\) 0.2 \\ PF-ZDMA-0 h & 11.4 \(\pm\) 1.1 & 688 \(\pm\) 34 & 3.0 \(\pm\) 0.1 & 6.6 \(\pm\) 0.3 & 29 \(\pm\) 1.4 \\ PF-ZDMA-24 h & 12.4 \(\pm\) 0.7 & 658 \(\pm\) 3  
The dynamic properties show a superior E' loss for samples with reduced CB content. This finding is related to a lower cross-link density of the samples with only 30 phr CB. Interestingly, all samples show a stable modulus with increasing temperature, except EPDM-15 ZDMA. Peak tan \(\delta\) is slightly shifted to higher values for reduced CB amount.