Abstract

Ethylene propylene diene monomer (EPDM) rubber/zinc dimethacrylate (ZDMA)-samarium methacrylate (Sm(MA)₃) rare earth complex as seals were prepared via in-situ formation of Sm(MA)₃ to partially replace the ZDMA. Compared with neat EPDM, incorporation of ZDMA-Sm(MA)₃ improved the curing activity of EPDM and a multiple crosslinking network formed with high crosslinking density. Improvement of the interfacial interaction facilitated distribution of the ZDMA-Sm(MA)₃ in the matrix and resulted in an increase of the mechanical properties of the composites compared with neat EPDM. In addition, partially replacing the ZDMA with Sm(MA)₃ significantly enhanced the durable sealing resilience performance of the composites by improving their free radical scavenging ability and inhibiting the degradation, oxidation and crosslinking reaction of the EPDM during stress-thermal oxidation aging.

摘要

乙烯丙烯二烯单体 (EPDM) 橡胶/二甲基丙烯酸锌 (ZDMA)-甲基丙烯酸钐 (Sm(MA) ₃ ) 稀土配合物作为密封件通过原位形成 Sm(MA) ₃以部分替代 ZDMA制备。与纯三元乙丙橡胶相比，ZDMA-Sm(MA) _{3 的加入}提高了三元乙丙橡胶的固化活性，并形成了具有高交联密度的多重交联网络。界面相互作用的改善促进了 ZDMA-Sm(MA) ₃在基体中的分布，与纯 EPDM 相比，复合材料的机械性能有所提高。此外，用 Sm(MA) ₃部分替代 ZDMA 通过提高复合材料的自由基清除能力和抑制三元乙丙橡胶在应力-热氧化老化过程中的降解、氧化和交联反应，显着增强了复合材料的持久密封回弹性能。