The objective of this work was to study the elastic recovery of EPDM samples crosslinked either by a phenolic resin (resol) or by a radical peroxide (dicumyl peroxide, DCP). From compression set experiments, it was observed that radically crosslinked EPDMs have better elastic recovery properties. On the other hand, for the same crosslinking density, radically crosslinked EPDM shows better compression set than EPDM crosslinked with phenolic resins. The Chasset-Thirion equation was then used to successfully fit the experimental relaxation curves. As a notable result, the preferential statistics of a peroxide-crosslinked network over a phenolic resin (resol) showed that better elastic recovery properties were obtained. Finally, the influence of fillers (carbon black and silica) was also studied. Carbon black with DCP crosslinking was shown to improve elasticity recovery whereas silica fillers lead to worse properties. It was then assumed that the interaction between particle surface and a voir comme dans autre publi à modifier ce crosslinking agent induced crosslinking gradients in the inter-particle volume. Graphical abstract

中文翻译：

---

交联三元乙丙橡胶的弹性恢复：化学和纳米填料的影响

这项工作的目的是研究由酚醛树脂（甲阶酚醛树脂）或自由基过氧化物（过氧化二异丙苯，DCP）交联的 EPDM 样品的弹性恢复。从压缩永久变形实验中，观察到自由基交联的 EPDM 具有更好的弹性恢复特性。另一方面，对于相同的交联密度，自由基交联的 EPDM 显示出比与酚醛树脂交联的 EPDM 更好的压缩永久变形。然后使用 Chasset-Thirion 方程成功拟合实验松弛曲线。一个值得注意的结果是，过氧化物交联网络优于酚醛树脂（甲阶酚醛树脂）的统计数据表明，获得了更好的弹性恢复性能。最后，还研究了填料（炭黑和二氧化硅）的影响。具有 DCP 交联的炭黑被证明可以提高弹性恢复，而二氧化硅填料会导致更差的性能。然后假设颗粒表面与 voir comme dans autre publi à modifier ce 交联剂之间的相互作用导致了颗粒间体积的交联梯度。图形概要