NR硫化返原动力学研究

依据ＮＲ硫化返原机理，提出了硫化返原动力学模型。用该模型对硫化曲线进行计算机模拟，可求出各反应速率常数，并能得到多硫键、双硫键和单硫键以及断裂交联键的浓度与硫化时间的函数关系。计算机模拟结果表明，由该模型得到的不同硫化温度下的模拟硫化曲线与实际硫化曲线相吻合，求出的各反应速率常数与硫化温度的关系符合Ａｒｈｅｎｉｕｓ方程。分解反应的活化能大于脱硫反应的活化能可以解释硫化温度越高，硫化返原程度越大

Study on Kinetics during NR Reversion

A model of the kinetics during NR reversion was proposed based on its reversion mechanism.The rate constants of different reactions were obtained by the computer simulation of vulcanization curves using the said model and thus the functional relationship between the poly ,di or mono sulfidic and broken crosslinks and the vulcanization time was derived.The simulated results showed that the simulated curves agreed well with the practical ones;and the relationship between the resultant rate constants and the vulcanization temperatures were in accordance with the Arrhenius equation.The activation energy of decomposition was higher than that of devulcanization,through which the fact that the higher the vulcanization temperature,the heavier the reversion,was explained.