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Epoxidized natural rubber (ENR)–silica hybrids without any other additives were prepared by an open‐mill mixing method at room temperature. The curing characteristics, crosslinking density, mechanical properties, and dynamical mechanical properties were investigated. The results indicate that the ENR–silica hybrid materials could be cured with silica as a crosslinking and reinforcing agent. Attenuated total reflection–Fourier transform infrared spectroscopy and solid‐state 13C‐NMR spectroscopy exposed the characteristics of the interfacial interaction in the hybrids and confirmed the existence of chemical bonds and hydrogen bonds between the epoxy group and SiOH. Scanning electron microscopy illustrated a good dispersion of silica in the ENR matrix. Meanwhile, the modulus at 100% elongation of the hybrid reached 9.64 MPa when 100‐phr silica was loaded; a similar trend was observed for the hardness. Finally, our findings might extend the concept of rubber curing and open a new space for making an environmentally friendly rubber composite. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44605.

This paper studied the influence on the properties of SBR/BR composites filled with carbon black (CB) and silica via adding epoxidized natural rubber (ENR-25) as a compatilizer. Payne effect, morphology, crosslink density, mechanical, and dynamic properties were studied. The results showed Payne effect receded by adding ENR-25 to SBR/BR/CB/silica composites and the aggregation of CB and silica both weakened as well. Thus, tear strength and modulus were improved significantly, also the crosslink density and bond rubber content Dynamic Mechanical Analyzer (DMA) data indicated the tand value at 0 and 608C increased when CB was replaced by silica. Meanwhile, the value at 08C exhibited a greater improvement than that at 608C when adding ENR-25, which means an excellent wet traction performance.

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