Silica-filled styrene butadiene rubber (SBR)/butadiene rubber (BR) compounds plasticized with mineral oils are mainly used to produce green tire treads. Previous works have demonstrated that the partial replacement of naphthenic oil (ONAF) by bio-based oils can provide processing and performance improvements for rubber compounds, along with environmental benefits. In this study, two modified soybean oils (esterified, OEST or esterified and epoxidized, OEPX) were investigated with the aim of evaluating the complete replacement of ONAF and determining whether the chemical properties of the oils affect the performance of silica-filled E-SBR/BR compounds, using the compound with ONAF as a reference. The physical properties, curing characteristics, morphology, and dynamic mechanical behavior were evaluated. The use of the modified soybean oils decreased the optimal cure time while increasing the crosslink density and the abrasive wear resistance. Further, the compounds with both modified soybean oils showed a good balance of mechanical properties. The modified soybean oils decreased the glass transition temperature of the rubber compounds, thus acting as true plasticizers. At 0°C, the tan δ value of E-SBR/BR/OEPX increased relative to that of E-SBR/BR/ONAF, whereas at 60°C, the values of the compounds with both modified soybean oils showed slight increases. The tan δ values reveal that compared with E-SBR/BR/ONAF, E-SBR/BR/OEPX has better wet grip and a similar rolling resistance, whereas E-SBR/BR/OEST has a higher rolling resistance. Thus, both modified soybean oils can fully replace ONAF and appear to be extremely attractive plasticizers for use in silica-filled E-SBR/BR compounds employed as green tire treads for passenger cars.

用矿物油增塑的二氧化硅填充的丁苯橡胶（SBR）/丁二烯橡胶（BR）化合物主要用于生产生胎面。先前的工作表明，用生物基油部分替代环烷油（ONAF）可以改善橡胶混合物的加工和性能，并具有环境效益。在这项研究中，研究了两种改性大豆油（酯化的OEST或酯化的和环氧化的OEPX），目的是评估ONAF的完全替代，并确定其化学性质是否会影响填充二氧化硅的E-SBR的性能。 / BR化合物，使用带有ONAF的化合物作为参考。评估了物理性能，固化特性，形态和动态力学行为。改性大豆油的使用减少了最佳固化时间，同时增加了交联密度和耐磨性。此外，具有两种改性大豆油的化合物均显示出良好的机械性能平衡。改性大豆油降低了橡胶混合物的玻璃化转变温度，因此可以用作真正的增塑剂。在0°C时，E-SBR / BR / OEPX的tanδ值相对于E-SBR / BR / ONAF的tanδ值增加，而在60°C时，两种改性大豆油的化合物的tanδ值略有增加。tanδ值表明，与E-SBR / BR / ONAF相比，E-SBR / BR / OEPX具有更好的湿抓地力和类似的滚动阻力，而E-SBR / BR / OEST具有更高的滚动阻力。从而，