The preparation and properties of thermoreversible ethylene propylene diene rubber (EPDM) based on reversible Diels-Alder reaction were investigated. The reversible cross-linking ethylene propylene diene rubber was prepared by a two-step method. The EPDM which was grafted with maleic anhydride (MA) was firstly modified by furfurylamine to graft furan groups on rubber backbone, and then crosslinked with bismaleimide (BMI) via a Diels-Alder reaction. At room temperature, thermoreversible cross-linking EPDM exhibited excellent mechanical properties. The molar ratio between BMI and MA was studied, and it was found that too high and too low ratios were not conducive to the formation of high cross-linking density network. When the molar ratio between BMI and MA was 0.9, the cross-linking EPDM had the best mechanical property, with tensile strength of 2.3 MPa and the elongation at break of 312%. The dynamic mechanical analysis and dissolution experiments showed that the reversible Diels-Alder reaction at high temperatures led to the de-crosslinking of rubber networks. Despite the presence of a small number of side effects, the EPDM obtained by Diels-Alder reaction showed a better reshaping ability, and it could be recycled several times.

研究了基于可逆Diels-Alder反应的热可逆三元乙丙橡胶(EPDM)的制备及其性能。采用两步法制备可逆交联乙丙二烯橡胶。将其与马来酸酐（MA）接枝的EPDM是首先通过糠胺改性接枝橡胶骨架呋喃基，然后用双马来酰亚胺（BMI）的交联通过Diels-Alder 反应。在室温下，热可逆交联 EPDM 表现出优异的机械性能。研究了BMI与MA的摩尔比，发现过高和过低的比例都不利于高交联密度网络的形成。当BMI与MA的摩尔比为0.9时，交联EPDM的力学性能最好，拉伸强度为2.3 MPa，断裂伸长率为312%。动态力学分析和溶解实验表明，高温下可逆的 Diels-Alder 反应导致橡胶网络的去交联。尽管存在少量副作用，但通过 Diels-Alder 反应获得的 EPDM 显示出更好的整形能力，并且可以多次回收利用。