High scission of butadiene rubber vulcanizate under thermo-oxidation
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,...
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Published in | Polymer degradation and stability Vol. 167; pp. 292 - 301 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
London
Elsevier Ltd
01.09.2019
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | 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.
•High scission of BR vulcanizate was realized by thermal oxidation.•The highest sol fraction of BR vulcanizate is over 70%.•Oxidation, scission and recombination of BR occurred simultaneously. |
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ISSN: | 0141-3910 1873-2321 |
DOI: | 10.1016/j.polymdegradstab.2019.07.015 |