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Styrene-butadiene

About: Styrene-butadiene is a research topic. Over the lifetime, 5568 publications have been published within this topic receiving 62099 citations. The topic is also known as: styrene-butadiene rubber & SBR.


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Journal ArticleDOI
TL;DR: Rubber nanocomposites based on styrene-butadiene rubber (SBR) and organophilic layered silicate were prepared and characterized in this paper, showing an increase in the minimum and maximum torques, acceleration of the vulcanization process, and improved mechanical properties.
Abstract: Rubber nanocomposites based on styrene–butadiene rubber (SBR) and organophilic layered silicate were prepared. Clay structures based on dodecyl benzene sulfonic acid (DBSA), nonyl phenol ethoxylate (NPE), and DBSA/NPE (50/50%) were prepared and characterized. The results indicate the intercalation of the used surfactants within the clay layers. Varying amount of organoclay, 2, 4, 6, 8, and 10 (phr), was added to the SBR matrix. X-ray diffraction revealed exfoliated structure for the modified clay–SBR composites. No new component in the rubber was found by fourier transform infrared measurements (FTIR). Scanning electron microscopy showed a uniform distribution of the modified clay with mixed DBSA/NPE (6 phr) in the matrix. The rheometric characteristics and physicomechanical properties of the SBR compounds were analyzed. The effect of DBSA/NPE clay loading on aging resistance of SBR nanocomposites at 90 ± 1°C for 4 and 7 days was also investigated. Rubber nanocomposites displayed an increase in the minimum and maximum torques, acceleration of the vulcanization process, and improved mechanical properties, with organoclay content up to 6 phr. This effect was more noticeable in the presence of the treated clay with DBSA/NPE. Also incorporation of DBSA/NPE-clay (6 phr) resulted in significant improvement of the degradation profile of the nanocomposites at 90 ± 1°C for 4 days. POLYM. COMPOS., 36:1293–1302, 2015. © 2014 Society of Plastics Engineers

22 citations

Journal ArticleDOI
TL;DR: In this paper, a high-temperature morphological transition in a styrene-butadiene-styrene block copolymer of 7S-43B-7S was observed.
Abstract: Electron microscopy reveals a high-temperature morphological transition in a styrene-butadiene-styrene block copolymer of 7000 polystyrene block molecular weight and 43,000 polybutadiene block molecular weight (7S-43B-7S). Samples quenched in liquid nitrogen from temperatures above 150°C show no structure, whereas those quenched from temperatures below 140°C clearly show a multiphase structure. We previously reported that the 7S-43B-7S polymer exhibits a relatively sharp melt rheological transition in the temperature region between 140 and 150°C from highly viscoelastic and nonlinear viscous behavior to linear viscous behavior with insignificant elasticity. The dynamic viscoelastic properties are measured at different strain amplitudes in this study, and the results show that the melt rheological transition behavior is not influenced by the strain amplitude. This study clearly shows that the melt rheological transition in the 7S-43B-7S results from a morphological transition from a multiphase structure below about 140°C to a single-phase structure above about 150°C.

21 citations

Journal ArticleDOI
TL;DR: In this article, a carboxylated styrene butadiene rubber latex (c-SBR) was used for the formulation of an exterior grade paint and construction of a mathematical model to predict water uptake of the dry film.

21 citations

Journal ArticleDOI
TL;DR: In this article, the thermal degradation of styrene-butadiene rubber has been studied thermo-gravimetrically using various heating rates (10, 20, 30, 40 K/min) and various atmospheres (pure N2, 3% H2/N2, air, 30% O2 /N2).
Abstract: The thermal degradation (pyrolysis and combustion) of styrene-butadiene rubber has been studied thermo-gravimetrically using various heating rates (10, 20, 30, 40 K/min) and various atmospheres (pure N2, 3% H2/N2, air, 30% O2/N2). Calculation of apparent kinetic parameters pre-exponential factor, activation energy and reaction order for the different conditions was done to enable modeling efforts. Gas phase chemical species measurement provides some insight into the possible degradation mechanisms and is explained. The outcome of the experiments show under gasification there is a single reaction mechanism occurring whereas in a combustion environment a two-stage reaction sequence (primary and secondary) is present at the tested heating rates. The primary reaction exhibits a thermal degradation that follows diffusion of oxygen to the surface, followed by gas phase oxidation, while the secondary reaction is more representative of a heterogeneous decay mechanism. Testing in a hydrogen-spiked atmosphere, surp...

21 citations

Journal ArticleDOI
TL;DR: In this article, compositions with incorporation of SBR (styrene butadiene rubber) and EPDM (ethylene propylene diene rubber), in specific ASTM formulation for each elastomer, were prepared.
Abstract: One alternative for elastomeric scraps generation is its incorporation in conventional formulations in the industry itself. In this work, compositions with incorporation of SBR (styrene butadiene rubber) and EPDM (ethylene propylene diene rubber) industrial scraps, in specific ASTM formulation for each elastomer, were prepared. Rheometric characteristics, mechanical properties and the morphology of the compounds developed were evaluated. With the ground scraps incorporation the vulcanization time decreases, comparing with compounds without ground scraps. The amount of scraps for the best tensile strength properties was 37 and 196 phr for SBR and EPDM compositions, respectively. Micrographs corroborated the mechanical results, indicating the best homogeneity of the scraps in the elastomeric matrix for these compositions.

21 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023118
2022229
2021159
2020239
2019313
2018348