Characterization of styrene butadiene rubber and microwave devulcanized ground tire rubber composites

Abstract

Ground tire rubber (GTR) was devulcanized by microwaves at the same heating rate (constant power) and different times of exposure. The devulcanized rubber (DV-R) and untreated GTR were characterized physically and thermally. Composite materials were prepared from different proportions of the GTR, which was used as a filler, and the DV-R, which was used as part of the styrene butadiene rubber (SBR) matrix, and by varying the exposure time of the microwave power. These composites were compared with a control sample that was prepared from virgin SBR. The sol content (soluble part) and Fourier transform infrared spectroscopy (FTIR) analyses of the devulcanized samples were examined to define the efficiency of devulcanization. The cure characteristics and tensile properties of the SBR composites were researched. In this study, it was found that using DV-R as part of the rubber matrix produced much better properties than using GTR as a filler, thereby showing the significant benefits of microwave devulcanization. At the DV-R content of 50 phr, the elongation at break of the DV-R 5 min/SBR composites increased to 445.06% from 217.25% for the GTR/SBR composites, i.e., the elongation at break was enhanced by 105% by the devulcanization of GTR. Scanning electron microscopy (SEM) photographs displayed a better interface coherence between the DV-R 5 min and SBR matrix than the GTR/SBR composites.

Polyurethane/ground tire rubber composite foams based on polyglycerol: Processing, mechanical and thermal properties

“…Those rubbers are main compounds used in car tires manufacturing. 21,22 The obtained results confirmed changes in chemical structure of GTR during auto-thermal reclamation at 60 C. High shear forces acting on GTR during low temperature extrusion caused scission of sulfide bonds. Crosslink density decrease corresponded to lower thermal stability of reclaimed GTR.…”

Reclaiming waste tire rubber by an irradiation technique

“…They characterized the conditions favorable for the microwave heating of the waste tires. Karabork et al [20] investigated on devulcanization of ground tire rubber by microwaves at the same heating rate (constant power) and different times of exposure. The devulcanized rubber (DV-R) and untreated GTR were characterized physically and thermally.…”

Effect of Temperature on Devulcanization of Waste Sidewall Rubber by Supercritical Ethanol

“…Band of C-H bond located in the range from 3100 to 2750 cm -1 does not show differences at different temperatures, 38,39 suggesting that the hydrocarbon backbone of sidewall rubber was not destroyed by higher temperature in supercritical ethanol.…”