Key Lab for Optoelectronic Technology and Systems, Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China.
Soft Matter. 2018 Oct 31;14(42):8521-8528. doi: 10.1039/c8sm01712c.
Magnetorheological elastomers (MREs) with outstanding magnetic-control properties are highly desirable for applications such as vibration attenuation, smart sensing, and soft robots. However, the low strength and thermolability of these materials still restrict their application in attenuating the vibration of large-scale devices. In this paper, we prepared an MRE based on ethylene-propylene-diene monomer (EPDM)/methylvinyl silicone rubber (MVQ) polymer blends. The resulting MRE showed good thermostability and mechanical properties. Good interfacial interaction and particle dispersion were achieved by modifying the surface of carbonyl iron powder (CIP) with silica coating by the sol-gel method. The compatibility between the EPDM and MVQ was promoted using silane coupling agents. Moreover, the resulting MRE had high mechanical strength and elongation at break. The dynamic viscoelastic properties of the MRE were tested using a rheometer. The influences of frequency, strain, matrices, temperature, and magnetic fields were discussed comprehensively, and relevant physical mechanisms were proposed. Finally, thermal aging tests were performed to evaluate the heat resistance of the MRE. Analytical results showed that the resulting MRE could be significantly applied to reduce the vibration of large devices because of its excellent mechanical properties and thermostability.
磁流变弹性体（MRE）具有出色的磁控性能，非常适用于减振、智能传感和软体机器人等应用。然而，这些材料的强度低和热稳定性差仍然限制了它们在衰减大型设备振动方面的应用。本文制备了一种基于三元乙丙橡胶（EPDM）/甲基乙烯基硅橡胶（MVQ）聚合物共混物的 MRE。所制备的 MRE 表现出良好的热稳定性和机械性能。通过溶胶-凝胶法对羰基铁粉（CIP）表面进行硅烷偶联剂改性，实现了良好的界面相互作用和颗粒分散。硅烷偶联剂促进了 EPDM 和 MVQ 的相容性。此外，所制备的 MRE 具有较高的机械强度和断裂伸长率。采用流变仪测试了 MRE 的动态黏弹性性能。综合讨论了频率、应变、基体、温度和磁场的影响，并提出了相关的物理机制。最后，进行了热老化试验以评估 MRE 的耐热性。分析结果表明，由于其出色的机械性能和热稳定性，所制备的 MRE 可显著应用于大型设备的减振。
