白炭黑补强环氧化溶聚丁苯橡胶

为探究环氧化对白炭黑(SiO₂粒子)在溶聚丁苯橡胶(SSBR)基体中分散性的作用,首先,以SSBR和环氧化溶聚丁苯橡胶(ESSBR)为基体,白炭黑为补强填料,分别制备了SiO₂/SSBR、SiO₂/ESSBR混炼胶和硫化胶;然后,采用FTIR、SEM和其他测试方法研究了材料的结构、形貌、硫化特性、耐磨性能、准静态力学性能和动态力学性能。结果表明:随环氧度从0增大到14.73%,生胶的门尼黏度增大。ESSBR分子链中的环氧基团与SiO₂粒子表面的硅羟基反应形成稳定的化学键,抑制SiO₂粒子团聚,促进其均匀分散;当环氧度为6.87%时, SiO₂粒子在ESSBR中的分散性最好。随环氧度增大, SiO₂/ESSBR硫化胶的拉伸强度先增大后减小、耐磨性能先增强后减弱、断裂伸长率降低、100%和300%定伸强度增大、玻璃化转变温度升高、0℃时的损耗因子显著增大、抗湿滑性增强、60℃时的损耗因子略有增加且滚动阻力增大。因此, SSBR硫化胶经环氧化改性后综合性能提高,当其环氧度在6.87%~8.51%范围内时, SiO₂/ESSBR硫化胶的综合性能最优。 

Silica reinforcing epoxidized solution-polymerized styrene butadiene rubber

In order to investigate the effects of epoxidation on the dispersibility of silica (SiO₂ particles) in solution-polymerized styrene butadiene rubber (SSBR) matrix, SSBR and epoxidized solution-polymerized styrene butadiene rubber (ESSBR) were used as matrix, silica were used as reinforcer firstly, SiO₂/SSBR and SiO₂/ESSBR rubber compounds and vulcanizates were prepared, respectively. Then, the structure, morphology, vulcanization characteristics, wear resistance, quasi-static mechanical properties and dynamic mechanical properties of the materials were investigated by FTIR, SEM and other testing methods. The results show that the Mooney viscosity of crude rubbers increases with the epoxidation degree growing from 0 to 14.73%. The epoxy groups in ESSBR chains react with the silanol groups on the surfaces of SiO₂ particles, thus forms stable chemical bonds which depress the aggregation of SiO₂ particles and promotes the uniform desperation of them. When the epoxidation degree is 6.87%, SiO₂ particles have the best dispersity in ESSBR. With the epoxidation degree increasing, the tensile strength of SiO₂/ESSBR vulcanizates increases firstly and then decreases, wear resistance enhances firstly and then reduces, the elongation at break decreases, stretching strengths at 100% and 300% increase, glass transition temperature increases, loss factor at 0℃ increases significantly, wet-skid resistance enhances, loss factor at 60℃ increases slightly and rolling resistance increases. Therefore, the comprehensive performances of SSBR vulcanizates after epoxidation modification enhance, when the epoxidation degree is within the scope of 6.87%-8.51%, the comprehensive performance of SiO₂/ESSBR vulcanizate reaches the best.