Abstract
The cross-linked structure of butadiene rubber (BR) vulcanizate presents a challenge to the environmentally benign recycling of waste tires. The high scission of BR vulcanizate was realized by thermo-oxidation in the presence of soybean oil. The effects of the mass ratio of rubber to oil (2:1, 1:1, 2:3, 1:2 and 2:5), oxidation time (0.5, 1, 2, 3, 5, 7 h) and temperature (130, 140 and 160 °C) on degradation were investigated by measuring the evolution of the sol fraction and cross-link density of degraded BR. The results showed that the BR vulcanizate was degraded effectively under thermo-oxidation (140 °C, 3 h), resulting in the highest sol fraction of 70.7%. Furthermore, the structural evolution of degraded BR was studied by gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). Oxidation, scission and recombination of the cross-linked network of BR occurred simultaneously during thermo-oxidation. The scission of the BR vulcanizate was enhanced by suppressing the recombination of BR chains in the presence of soybean oil.
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