表面氧化改性对丁腈橡胶力学性能的影响

为了提高丁腈橡胶的力学及摩擦学性能，利用以浓硫酸为主配制的氧化性溶液对其进行表面化学改性.研究了硫酸浓度、浸泡时间对丁腈橡胶表面力学和摩擦学性能的影响，借助SEM分别观察其断裂和磨损形貌，分析了表面改性对丁腈橡胶性能的影响.结果表明，经50%硫酸混合溶液处理的丁腈橡胶，其力学和摩擦学性能随浸泡时间的延长而大幅度提高；经70%硫酸混合溶液处理的则结果相反.硫酸浓度过大可使表面组织致密性增加、硬度增大，但表面出现裂纹，其力学性能和摩擦学性能大幅下降.

Effect of surface oxidative modification on mechanical properties of nitrile rubber

In order to improve the mechanical and tribological properties of nitrile rubber （NBR）, the surface chemical modification was performed with the oxidation solution mainly formulated by the concentrated sulfuric acid. The effect of sulfuric acid concentration and immersion time on both mechanical and tribological properties of NBR surface was investigated. In addition, the fracture and wear morphologies of NBR surface were observed with scanning electricon microscope （SEM）, and the influence of surface modification on the NBR performance was analyzed. The results indicate that with increasing the immersion time, the mechanical and tribological properties of NBR treated by the 50% sulfuric acid mixed solution get greatly improved, while the NBR treated by the 70% sulfuric acid mixed solution exhibts the contrary consequences. When the concentration of sulfuric acid is extra high, although the density and hardness of 〖JP2〗NBR surface get improved, the cracks will appear on the surface, which significantly reduces the mechanical and tribological properties of NBR.