橡胶改性尼龙6动力学

Kinetics of rubber-modified nylon 6

采用酰基己内酰胺封端的丁腈橡胶(CHTBN)或丁苯橡胶(CHTBS)与NaOH作为引发催化体系,反应温度在145～160℃之间,通过绝热法测定反应过程的温升曲线,计算得到了动力学参数。采用CHTBN/NaOH时反应级数为一级,活化能在72.91～73.16kJ.mol-1之间,指前因子在3.22×1011～3.38×1011mol1-n.s-1范围内;采用CHTBS/NaOH时反应级数在1.23～1.34之间,偏离了1级反应,活化能在85.55～86.88kJ.mol-1之间,指前因子在4.52×1011～5.09×1011mol1-n.s-1范围内。在前人工作的基础上建立了阴离子聚合绝热反应动力学模型并对反应过程进行了模拟,结果与实验温升曲线具有很好相关性,从而证明了模型的合理。

Kinetic parameters were calculated based on the curve of reactive temperature rise measured with the adiabatic approach in the temperature range of 145℃ to 160℃ for the catalytic system of NaOH and acyl caprolactam end-capped butadiene-acrylonitrile rubber （CHTBN） or styrene-butadiene rubber （CHTBS）. The reaction was first order, the activation energy was between 72.91 73.16 kJ ·mol^-1 and the pre-exponential factor was between 3.22 ×10^11 3.38 ×10^11 mol^-1·s^-1 in the system of CHTBN/ NaOH. While in CHTBS/NaOH, the reaction order was between 1.23 1.34, the activation energy was between 85.55--86.88 kJ·mol^-1 and the pre-exponential factor was between 4.52×10^11 5.09×10^11 mol^-1· s^-1. The adiabatic reaction kinetic model of caprolactam anion was established based on prior research findings, and the polymerization reaction was simulated with the kinetic model. The agreement between simulation results and experimental data showed that the model was reasonable and correct.