'Mechanism of vulcanization reaction of asphalt components and cis-1,4-polybutadiene rubber'

Asphalt was separated into 4 components, saturated, aromatic, resin and asphaltene, according to its polarity. The effect of the 4 components on the vulcanization process and vulcanization effect of cis-1,4-polybutadiene rubber (BR) were investigated. The results showed that the saturated and aromatic components in asphalt could prolong the scorch time of BR and improve the processing safety. Resin and asphaltene could effectively increase the maximum torque of compound and accelerate the curing rate. Asphalt prolonged the scorch time and accelerated the curing rate of the BR compound, but it could slightly reduce the maximum torque. The oxygen, nitrogen, and sulfur functional groups which were rich in resins and asphaltenes could effectively participate in the vulcanization reaction of BR.