A thermally reversible healingEPDMbased elastomer with higher tensile properties and damping properties

作者：Xiong, Chengtian; Li, Xiaoqing; He, Hezhi^*; Xue, Bin; Wang, Yi; Li, Jiqian; Zhu, Zhiwen^*

来源：Journal of Applied Polymer Science, 2021, 138(5): e49767.

DOI：10.1002/app.49767

• ethylene-propylene-diene-monomer rubber (EPDM)
• H-bonding
• Zn-based-bonding
• fracture energy
• damping properties

Due to the disadvantages of lower tensile strength and fracture toughness, the widely application of Ethylene-propylene-diene-monomer rubber (EPDM) has been limited. In this study, a thermally reversible healing EPDM based elastomer with H-bonding and Zn-based-bonding dynamic cross-link network was prepared. The influence of mole ratio of ATA/MAH on tensile strength and fracture energy of mEPDM(0)-xATA was investigated. The results showed that increasing the content of ATA brings about a gradual improvement in tensile strength of the mEPDM(0)-xATA. Especially when the mole ratio of ATA/MAH is 1, the fracture energy of mEPDM(0)-ATA is dramatically enhanced to 33.9 MJ/m(3), which is best among the ratios studied in our research. After curing, the effect of ZnCl(2)content on tensile strength and fracture energy of mEPDM-ATA-nZn was also studied. Meanwhile, the uniaxial cyclic loading-unloading tensile test was used to study the viscous damping properties of mEPDM-ATA-0.4Zn, which showed reversible repair properties after heat treatment. The results of dynamic rheological measurement showed that the damping properties were improved.