Study of the cure characteristics and viscoelastic behavior of styrene‐butadiene rubber compounds by using a rubber process analyzer

Abstract

Viscoelastic and cure properties of styrene-butadiene rubber compounds were investigated by using a ''Rubber Process Analyzer.'' The effects of sulfur content in the cure system and carbon black (CB) type and concentration on the cure behavior of samples were studied. As the ratio of S/accelerator in the curative increased, the cure rate increased, and the cure time decreased. Here, the elasticity was analyzed by considering the drop in the maximum of viscous torque (D S 00 ) and the resilience, which increased for the cure systems in the order of conventional < semiefficient < efficient. Compounds with the higher loading and fine particle size of CB had the greater cure torque values, higher vulcanization rates, and the lower cure times. With increasing CB content and CB specific surface area, D S 00 diminished, hence the elasticity. The Payne effect was observed in all strain-sweep curves. At higher level and surface area of CB, the linear viscoelastic region disappeared, and the strain dependency of G 0 was more pronounced. For higher loading and smaller particle size of CB, the relaxation modulus declined rather abruptly, and relaxation time increased. These observations signified more viscous and less elastic responses in these samples. Viscoelastic properties of compounds were explained by considering the hydrodynamic and dilution effects.

Characterization of the Viscoelastic and Vulcanization Behavior of Natural Rubber Nanocomposites Having Different Levels of Nano Silicate/Black

“…Therefore, with existence of more BK amounts in the compound cure process occurs faster, scorch time decreases and rate of cure increases. We found the same observation in the curing process of black loaded SBR compounds [10]. In contrast, incorporating of NS does not change the rate of cure significantly.…”

“…Therefore, it is necessary to find the BK effects on the behavior of compound before, after and during the process. Many researchers have investigated into the influences of BK on the thermal and mechanical [1][2][3][4][5][6][7][8], rheological and viscoelastic [9][10][11] and vulcanization [10,11,13] properties of filled compounds. The interfacial area between rubber and carbon black increases with dispersion therefore the new bonds are created, which affect the compound behavior.…”

Effects of two types of nanoparticles on the cure, rheological, and mechanical properties of rubber nanocomposites based on the NBR/PVC blends

“…The study on the stress relaxation test is an important criterion to determine the viscoelastic properties of the nanocomposites . Figure shows the relaxation modulus versus time, before and after cure, for the unfilled blends and nanocomposites reinforced with various amounts of GNP and OMMT.…”

Influence of different types and amounts of crosslinking agent on the curing process of silicone rubber

“…There are several investigations in literature which investigate the curing characteristics of rubber when using a rubber process analyser (=RPA), e.g. [12][13][14][15][16].…”

“…Owing to this, the rheological characterisations of gum and rubber compounds and the curing behaviour of these compounds were able to be investigated using an RPA. [6,[12][13][14]19, 20]…”