不同维度二氧化硅/天然橡胶复合材料制备及性能研究

Preparation and properties of different dimension silica/natural rubber composites

使用双-[γ-(三乙氧基硅)丙基]四硫化物(TESPT)改性三种维度二氧化硅(SiO_(2))填充天然橡胶制备复合材料,借助FI-TR、DMA、阿克隆磨耗机等对其进行表征。结果表明,SiO_(2)未改性时,零维SiO_(2)/天然橡胶复合材料具有最高的抗湿滑性能和最低的滚动阻力;一维SiO_(2)/天然橡胶复合材料具有最高的交联密度;二维SiO_(2)/天然橡胶复合材料具有最高的填料-橡胶相互作用和耐磨性。经过TESPT改性后,一维改性SiO_(2)/天然橡胶复合材料展示了最高的交联密度、拉伸强度、抗湿滑阻力和耐磨性,二维改性SiO_(2)/天然橡胶复合材料具有最低的滚动阻力。相对于未改性SiO_(2),三种维度改性SiO_(2)/天然橡胶复合材料硫化时间减小,焦烧行为改善,交联密度增大,填料在基体中分散性变好,填料-橡胶相互作用提高。

Bis-[3-(triethoxysilyl)propyl]tetrasulfide(TESPT)was used to modify three different-dimensional silicas to fill natural rubber to prepare composite materials,and the obtained composite materials were characterized by FI-TR,DMA and Akron abrasion machine.The results showed that the zero-dimensional silica/natural rubber composite had the highest wet skid resistance and the lowest rolling resistance when the silica was not modified.One-dimensional silica/natural rubber composites had the highest crosslinking density,and two-dimensional silica/natural rubber composites had the highest filler-rubber interaction and wear resistance.After TESPT modification,one-dimensional modified silica/natural rubber composites showed the highest crosslinking density,tensile strength,wet skid resistance and wear resistance,and two-dimensional modified silica/natural rubber composites had the lowest rolling resistance.Compared with unmodified silica,after TESPT modification,the vulcanization time of three different-dimensional modified silica/natural rubber composites decreased,the scorch behavior was improved,the crosslinking density increased,the dispersion of fillers in the matrix was enhanced,and the filler-rubber interaction increased.