Accelerated aging of elastomeric composites with vulcanized ground scraps

Abstract

The aim of this work is to study the effect of thermal aging on the mechanical, dynamic-mechanical, and chemical properties of SBR (styrene-butadiene rubber) composites filled with SBR industrial rubber scraps. Eight composites with varying proportions (10-80 phr) of the SBR ground scraps (SBR-r) were prepared and subjected to accelerated aging in an air-oven. The composites were evaluated, and the results were compared with a control sample (base formulation with 0 phr of SBR-r), before and after thermal aging. The accelerated aging led to a decrease in the mechanical properties as a result of an increase in the stiffness of the material, related to an increase in the crosslink density. However, these properties were not affected by the addition of rubber scraps up to 50 phr, either before or after aging. The increase in the glass transition temperature of the composites after aging, measured using dynamic mechanical analysis, confirmed the occurrence of a postcrosslinking process. Fourier transform infrared spectroscopy and crosslink density revealed that the aging mechanism was dependent on the SBR-r content.

Styrene‐Butadiene Rubber/Modified Ground Tire Rubber Blends Co‐Vulcanization: Effect of Accelerator Type

“…Similar behavior was observed for SBR/reclaimed rubber blends . In fact, contrary to reclaimed rubber, addition of higher amount of mGTR increases T g of SBR/mGTR . This phenomenon suggests low compatibility of partially cross‐linked mGTR with SBR matrix and confirms co‐vulcanization of SBR and modified GTR.…”

“…[35,36] In fact, contrary to reclaimed rubber, addition of higher amount of mGTR increases T g of SBR/mGTR. [37] This phenomenon suggests low compatibility of partially cross-linked mGTR with SBR matrix and confirms co-vulcanization of SBR and modified GTR. Assuming that the values of DM from curing curves are related with cross-link density of SBR/ mGTR, obtained results of mechanical properties suggest increasing compatibility of styrene-butadiene rubber matrix and modified ground tire rubber blends cured with TMTD.…”

Effect of chain extender on structural and mechanical properties of poly(butylene succinate‐co‐adipate)/halloysite nanotube bionanocomposites

“…Carli also reported similar results for PHBV/ HNT nanocomposites. [31] Addition of the CE to the PBSA with the HNTs (Figure 5B) did not cause significant changes in the thermal degradation properties when compared to that observed without the CE owing to the lack of synergy between the CE and HNTs. The CE was partially adsorbed on the clay surface, thereby reducing its effect on the thermal stability of the nanocomposites.…”

Effect of cation-exchange bentonite on properties of acrylonitrile-butadiene rubber composites

“…Such behaviour suggests that during ageing, the crosslinking of rubber chains in NBR/CEBs composites mainly occurred. 26…”