A novel functional additive bis(2-citraconimide phenyl) disulfide, i.e. RK904, has been developed based on a traditional citraconimide anti-reversion agent with a new sulfur-containing structure. RK904 reacts with NR through the Michael Addition and Diels-Alder reaction with high reactivity according to density functional theory (DFT) calculations, enhancing cross-link density, adhesion strength and mechanical performance. RK904 stands out in adhesion performance and aging resistance as it enhances interfacial strength and matrix reinforcement. SEM/EDS confirms cohesive failure in rubber, indicating strong interfacial adhesion. RK904 provides an optimal balance of mechanical properties and durability, demonstrating strong potential for high-performance and sustainable tire applications.

• Effects of bis(2-citraconimide phenyl) disulfide, i.e. RK904, on reversion, cross-link density and mechanical properties of NR tread and belt compounds
• Effects of RK904 on steel cord adhesion performance of NR belt compound, including pull put force, failure mode, aging property, etc
• Mechanism and reactivity of reaction between RK904 and NR through the Michael Addition and Diels-Alder reaction characterized by density functional theory