Effect of Nanoclay-Carbon black Hybrid on Curing Behavior, Mechanical Properties, and Hysteresis of Styrene-Butadiene Rubber-Based Nanocomposites
Subject Areas :حمیدرضا حیدری 1 , مرضیه حسینی 2
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Abstract :
Due to its two-dimensional structure and high surface-to-volume ratio, nanoclay creates excellent tensile and rheological properties in nanocomposites. Rubber processing is highly dependent on the curing process and its control, time, temperature, vulcanization rate, and other curing conditions. Among all the methods for preparing nanocomposites, the melt mixing method is used more than other methods. In general, there are three structures for nanocomposites: tactoid, Intercalation, and Exfoliation, and the properties of nanocomposites are highly dependent on the dispersion of nanoparticles and their interaction with the matrix. In this study, the effect of the amount of nanofiller and process conditions on the curing behavior, mechanical properties, and hysteresis of a hybrid blend based on SBR and reinforced with nanoclay and carbon black prepared by melt mixing has been investigated. The results of the curing diagrams of the nanocomposite samples show that with increasing the amount of nanoclay, the curing time will decrease and the curing rate will increase, and increasing the amount of carbon black will lead to a significant reduction in the scorch time and curing time and a significant increase in the curing rate and torque mixing. Also, according to the tensile test results, with increasing the amount of nanoparticles, the mechanical properties have improved, and its further increase will cause a decrease in the mechanical properties. The hystresis diagrams show that with increasing the amount of reinforcements, and especially carbon black, the area under the stress-strain diagram in the loading-unloading mode increases significantly.
