Solution-polymerized styrene butadiene rubber (SSBR) and high cis -polybutadiene rubber (BR) are usually used as matrix and silane coupling agent (SCA) modified silica as the filler in the conventional green tire tread. However, the SCA cannot achieve uniform distribution of silica, moreover the modification process generates volatile organic compounds. In this work, a novel silica reinforced epoxidized SSBR(ESSBR)/epoxidized BR (EBR) nanocomposite (S-ESSBR/EBR) without SCA is prepared. The ESSBR and EBR with different epoxidation degree are synthesized by an oxidant H 2 O 2 and reaction-controlled phase-transfer catalyst CPC-PW 4 O 16 . The microstructure and performance of S-ESSBR/EBR nanocomposites are investigated and compared with the silica reinforced SSBR/BR nanocomposite (S-SSBR/BR-Si75) using Si75 as SCA. Silica nanoparticles transfer from ESSBR phase to EBR phase with increasing epoxidation degree of EBR, so the distribution of silica in two phases becomes homogeneous. The S-ESSBR/EBR nanocomposite exhibits high wet skid resistance , low rolling resistance and excellent abrasion resistance as green tire tread.
Blending a solution of polymerized styrene–butadiene rubber (SSBR) with natural rubber (NR) as a matrix and silane coupling agent (SCA) modified silica as filler is widely used to prepare green tire tread. However, it is difficult to adjust the distribution of silica in different phases of a rubber blend by SCA. Moreover, the coupling reaction between silica and SCA emits volatile organic compounds. In this work, we use a new strategy to improve the distribution of silica in two phases without a SCA. Epoxidized SSBR (ESSBR) and epoxidized NR (ENR) are synthesized, and the performance of silica-filled ESSBR/ENR nanocomposite (S-ESSBR12/ENR) is investigated and compared with that of silica-filled SSBR/NR nanocomposite (S-Si75-SSBR/NR) using Si75 as the SCA. The S-ESSBR12/ENR nanocomposites have stronger interfacial interaction that results in better silica dispersion than the S-Si75-SSBR/NR nanocomposite. The epoxy groups can effectively adjust the phase selective distribution of silica. The S-ESSBR12/ENR18 nanocomposite shows homogeneous distribution, leading to the best performance. Compared with S-Si75-SSBR/NR nanocomposite, S-ESSBR12/ENR18 nanocomposite increases wet-skid resistance by 118%, reinforcing index by 38%, and abrasion resistance by 40% and decreases rolling resistance by 23%. Moreover, S-ESSBR12/ENR nanocomposites are eco-friendly and have potential application in the production of green tire treads.
危险品化学品经营许可证（带存储）