Dual coordinated cross link networks were designed in epoxidized butadiene-acrylonitrile rubber (NBR)/CuSO₄ composites to make commercial NBR become advanced soft materials. First, NBR was modified through organic peroxy acid method to produce epoxidized butadiene-acrylonitrile rubber (ENBR). Next, CuSO₄ was introduced in bulk to form strong Cu²⁺-nitrile coordination bonds acting as strong cross link points and Cu²⁺-epoxy bonds acting as weak cross link points. XPS analysis, FT-IR spectra and rheological curves proved the dual coordination bonds. Curing rheology curves, crosslinking density and thermal properties effectively demonstrated the formation of related dual cross link networks. The ENBR/CuSO₄ composites exhibited excellent mechanical properties due to the synergistic effect of strong and weak metal-ligand coordination networks. During stretching, the weak coordination bonds acted as sacrificial bonds which could dissipate energy, while the strong coordination bonds sustained the network and imparted the elasticity. Under the combined functions of dual coordination bonds, the modulus, tensile strength, and toughness of ENBR/CuSO₄ composites could be improved and tuned by controlling the structure parameter of coordination networks such as epoxidation degree and content of CuSO₄.

在环氧化丁二烯-丙烯腈橡胶（NBR）/ CuSO ₄复合材料中设计了双配位交联网络，使商用NBR成为高级软材料。首先，通过有机过氧酸方法对NBR进行改性，以生产环氧化丁二烯-丙烯腈橡胶（ENBR）。接着，大量引入CuSO ₄，以形成充当强交联点的强Cu 2 ^+-腈配位键和充当弱交联点的Cu 2 ^+-环氧键。XPS分析，FT-IR光谱和流变曲线证明了双配位键。固化流变曲线，交联密度和热性能有效地证明了相关双交联网络的形成。ENBR / CuSO ₄由于强-弱金属-配体配位网络的协同作用，复合材料表现出出色的机械性能。在拉伸过程中，弱的配位键充当了可以消散能量的牺牲性键，而强的配位键则维持了网络并赋予了弹性。在双配位键的共同作用下，通过控制配位网络的结构参数，如环氧化度和CuSO ₄含量，可以改善和调节ENBR / CuSO ₄复合材料的模量，拉伸强度和韧性。