用非等温差示扫描量热法研究单甲基丙烯酸锌增强氢化丁腈橡胶的硫化反应动力学

摘要

The hydrogenated nitrile rubber (HNBR) composites were prepared with blends of hydroxyl zinc mono-methacrylate (HZMMA) and carbon black as reinforcer,dicumyl peroxide (DCP) as vulcanizing agent.Vulcanization kinetics were studied by non-isothermal differential scanning calorimetry (DSC) at different heating rates,the kinetic parameters were fitted,the optimum curing conditions were determined,and the effects of curing conditions on the mechanical properties of HNBR composites reinforced with HZMMA were investigated.The results showed that the reaction order of the vulcanization of the system was 0.95,the apparent activation energy was 123.59 kJ/mol,and the optimal vulcanization temperature and time were 165 ℃and 17 min respectively.Under the optimal vulcanization conditions,the tensile strength,modulus at 100％,elongation at break and permanent set of HNBR composites reinforced with HZMMA were 27.6 MPa,17.8 MPa,160％,2.5％ respectively.%以单甲基丙烯酸锌(HZMMA)和炭黑并用为增强剂,过氧化二异丙苯(DCP)为硫化剂,制备了HZMMA增强氢化丁腈橡胶(HNBR)复合材料,采用非等温差示扫描量热法(DSC)研究了不同升温速率下的硫化反应动力学,拟合了硫化动力学参数,确定了最佳硫化条件,考察了硫化条件对HZMMA增强HNBR复合材料物理机械性能的影响.结果表明,HZMMA增强HNBR体系的硫化反应级数为0.95,表现活化能为123.59 kJ/mol,最佳硫化反应温度和时间分别为165℃、17 min,在此硫化条件下制得的HZMMA增强HNBR复合材料的拉伸强度、100％定伸应力、扯断伸长率及永久变形可分别达到27.6 MPa、17.8MPa、160％、2.5％.