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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
Abstract: A study was made of the stress–strain and ultimate properties in simple tension of an elastomeric styrene-butadiene-styrene block copolymer (Kraton 101) and also of a similar material (Thermolastic 226) that contains about 35% plasticizer as well as inorganic pigments. Stress–strain data were obtained at crosshead speeds from 0.02 to 20 in./min at temperatures from -40 to 60°C. The relaxation rate, derived from the data at constant extension rates, was about 8% per decade of time for both materials at temperatures from −40 to about 40°C and at extensions from about 20% up to 400%. Above −30°C, the shift factor log aT was found to vary linearly with temperature. These findings indicate that the time and temperature dependence of the mechanical properties results primarily from the plastic (or viscoelastic) characteristics of the styrene domains. The tensile strength for Kraton 101 below 40°C is somewhat greater than 4000 psi, sensibly independent of extension rate and temperature. For the highly plasticized Thermolastic 226, the tensile strength at an extension rate of 1.0 min−1 increases from 2200 psi at 0°C to 3600 psi at −40°C. Above 40°C for Kraton 101 and above 0°C for Thermolastic 226, the tensile strengths are quite dependent on extension rate and temperature owing to the increased ductility of the styrene domains. The high strength of these materials results from the uniformly dispersed styrene domains of colloidal dimensions. To obtain a crack of sufficient size to satisfy an energetic criterion for self-sustained high-speed propagation, domains must be disrupted. The plastic characteristics of the domains have a controlling effect on crack growth and thus on the ultimate properties of the materials. The strength and extensibility of other elastomers are considered in relation to those of the block copolymers.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the pyrolysis kinetics of commercial grade styrene-butadiene rubber (SBR) were investigated by a dynamic thermogravimetry (TG) reaction system in a nitrogen atmosphere over the temperature range of 400 to 950 K at the nominal heating rates of 3, 5 and 7 K min−1.
Abstract: The pyrolysis kinetics of commercial-grade styrene–butadiene rubber (SBR), which is one of the major constituents of tyre rubber as well as one of the principal products of the rubber industry in Taiwan, was investigated by a dynamic thermogravimetry (TG) reaction system in a nitrogen atmosphere over the temperature range of 400 to 950 K at the nominal heating rates of 3, 5 and 7 K min−1. The experimental results indicated that the pyrolysis of SBR may be attributed to three reactions, with three distinct mass change characteristics in the mass-loss curves of reactant deduced from the experiments. The corresponding activation energies, frequency factors and reaction orders of the three reactions were determined. A simplified three-reaction model based on the mass-loss curves of reactant was also proposed for engineering purposes. Satisfactory agreements between the proposed model and the experimental results were obtained. The results of this study are useful for the utilization of scrap SBR as an energy resource.

28 citations

Journal ArticleDOI
TL;DR: In this article, the in-field aging of different PA layers is studied and the results showed that the carbonyl and sulfoxide content of the modified binders had increased for the top layers.

28 citations

Journal ArticleDOI
TL;DR: In this paper, hydrogenated styrene-butadiene-styrene (SEBS) elastomers were functionalized with 0.5 wt % maleic anhydride grafted on the midblock.
Abstract: Poly(ethylene terephthalate) (PET) was blended with 5 wt % of an elastomeric block copolymer. The hydrogenated styrene-butadiene-styrene (SEBS) elastomers were functionalized with 0–4.5 wt % maleic anhydride grafted on the midblock. Notched tensile tests in the temperature range − 40–55 °C differentiated among the blends in terms of their toughness. The least effective elastomer was the unfunctionalized SEBS; all the functionalized SEBS elastomers effectively increased the toughness of PET. Fractographic analysis indicated that PET and the blend with unfunctionalized SEBS fractured through a pre-existing craze. Although adhesion of the unfunctionalized SEBS to the matrix was poor, the elastomer strengthened the craze somewhat, as indicated by an increase in length of the pre-existing craze when final separation occurred. A functionalized SEBS caused the fracture mechanism to change from crazing to ductile yielding. Graft copolymer formed by reaction of PET hydroxyl end groups with the anhydride in situ was thought to act as an emulsifier to decrease particle size and improve adhesion. These factors promoted cavitation, which relieved the triaxiality at the notch root and permitted the matrix to shear yield.

28 citations

Journal ArticleDOI
TL;DR: In this article, the authors studied the transport behavior of eight esters into six commercial polymer membranes by immersion/weight gain experiments to determine how transport behavior is affected by the choice of the solvent molecules and the chemical structures of the polymer membranes.
Abstract: Sorption and diffusion of eight esters into six commercial polymer membranes have been studied by immersion/weight gain experiments to determine how the transport behavior is affected by the choice of the solvent molecules and the chemical structures of the polymer membranes. The temperature dependence of transport parameters was found to follow the Arrhonius activation theory. It has been proved that the kinetics of equilibrium concentration can be described by the first-order kinetic rate equation. Furthermore, the results of transport parameters have been discussed in terms of the size, shape, and chemical nature of the diffusant molecules.

28 citations


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