Abstract
ABSTRACT The devulcanization reaction of SBR-based ground tire rubber (GTR) in GTR/EPDM blend was investigated through a co-rotating twin-screw extruder by increasing the screw rotation speed in the presence of subcritical fluids (water, ethanol, and propanol). The influences of the screw rotation speed, the promoting agents, and temperature were investigated. The results show that subcritical fluid, which is a swelling agent and reaction medium, promotes the devulcanization reaction, increases the selectivity of crosslink breakage, keeps the extrusion material from oxidative degradation, reduces the gel particle size of the devulcanized blends, and significantly improves the mechanical properties of the revulcanizate. Among different subcritical fluids (water, ethanol, propanol), the influence of subcritical ethanol is significantly obvious. When promoting agent 450 is added under the best reaction conditions (ethanol, 200 °C, 2.2 Mpa, and 600 rpm), the tensile strength and elongation at break of the revulcanizate retains 99.6% and 209% of vulcanized SBR (24.0 MPa, 356%), respectively.
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