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Effect of multifunctional samarium lysine dithiocarbamate on curing properties, static and dynamic mechanical properties of SBR/silica composites

Zou, Yongkun, He, Jingwei, Tang, Zhenghai, Zhu, Lixin, Luo, Yuanfang, Liu, Fang
RSC advances 2015 v.6 no.1 pp. 269-280
Lewis bases, crosslinking, lysine, mechanical properties, rubber, samarium, silica, stearic acid, tires, zinc, zinc oxide
In this work, a novel multifunctional rubber agent named as samarium lysine dithiocarbamate (Sm-LDC) was synthesized by a nucleophilic addition reaction and coordination reaction. Then the influences of Sm-LDC on curing properties, and static and dynamic mechanical properties of SBR/SiO₂ composites were studied. The results showed that Sm-LDC is not only capable of accelerating the vulcanization of SBR compounds even without zinc oxide (ZnO) and stearic acid (SA), also conducive to improve the crosslinked network. Notably, SBR/Sm-LDC/SiO₂ composites exhibit superior static and dynamic mechanical properties in comparison with the SBR/SiO₂ composite containing conventional accelerator zinc diethyl dithiocarbamate (ZDC), and activators ZnO and SA. Such improvement is attributable to the improved dispersion of SiO₂, the enhanced filler–rubber interaction, and the high vulcanization and reinforcing efficiency of Sm-LDC. Accordingly, the excellent comprehensive performance may make Sm-LDC very competitive in the application in green tires and the preparation of high performance rubber composites.