Topic
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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TL;DR: In this paper, the dielectric constant ϵ′ and loss ϵ″ have been investigated for SBR samples vulcanized with TMTD and loaded with silica in increasing quantities in the frequency range from 60 Hz to 108 Hz at room temperature.
Abstract: The dielectric constant ϵ′ and dielectric loss ϵ″ have been investigated for SBR samples vulcanized with TMTD and loaded with silica in increasing quantities in the frequency range from 60 Hz to 108 Hz at room temperature. Also, the physico-mechanical properties of these samples have been investigated.
The results of ϵ′ and ϵ″ are analysed using the Cole—Cole method. Two absorption regions are found: a low frequency absorption region with a maximum at about 10 kHz which is attributed to Maxwell—Wagner effect and a high frequency absorption region with a maximum at 107 Hz which is due to the orientation of polar groups. A third absorption region appeared at frequencies below 100 Hz and may be due to absorption of moisture arising from the presence of silica in the sample.
24 citations
TL;DR: In this article, the effects of several heterocyclic compounds containing nitrogen, trisubstituted amines and diamines in preventing thermooxidative degradation of styrene-butadiene rubber (SBR) were studied using non-isothermal DSC measurements.
Abstract: Effects of several heterocyclic compounds containing nitrogen, trisubstituted amines and diamines and molecules based on N,N,N′,N′,N′′,N′′-substituted-[1,3,5]triazine-2,4,6-triamine in preventing thermooxidative degradation of styrene–butadiene rubber (SBR) have been studied using non-isothermal DSC measurements. The aim of this study was to determine and compare the stabilizing effect of individual compounds and to select the structures with the best antioxidative properties. In order to compare the stabilizing effect of the compounds, induction periods and protection factors have been calculated. The treatment of the experimental data was carried out using a method based on a non-Arrhenian temperature function. The results show that better antioxidative properties can be assigned to heterocyclic compounds. On the other hand, molecules containing triazine structures exhibited only negligible stabilizing effect on SBR at lower temperatures and even destabilizing effect at higher temperatures.
24 citations
TL;DR: In this article, phenolic resin (PF) was used to obtain the highest performance of styrene-butadiene rubber (SBR) modified asphalt, and the changes on physical properties of asphalt binder such as penetration, softening points, storage stability, ductility, elastic recovery, and viscosity measurement with different content of SBR and PF (1-5%) were investigated.
24 citations
Journal Article•
TL;DR: In this paper, the effect of crosslink density on the transport behavior of aromatic hydrocarbons through conventionally crosslinked SBR samples was thoroughly examined and a comparison between theoretical and experimental diffusion results was carried out.
Abstract: Molecular transport of aromatic hydrocarbons through conventionally crosslinked SBR samples was conducted in the temperature interval of 25-65°C. The effect of crosslink density on the transport behaviour was thoroughly examined. The samples with high crosslink density exhibited the minimum solvent uptake. The mechanical properties of unswollen, swollen and deswollen SBR membranes were measured according to standard test methods. The effects of temperature and penetrant size on the transport process have also been studied. Values of the diffusivity and activation energy for diffusion were estimated from the diffusion data. Finally a comparison between theoretical and experimental diffusion results was carried out.
23 citations
TL;DR: In this article, the results of measurements show that the micelles are very small particles (radius of gyration up to 20nm) of a high weight (up to 15·106); consequently, the average volume fraction of the polymer in the space occupied by a micelle attains unusually large values.
Abstract: Dilute solutions of styrene/butadiene/styrene (SBS) block copolymers of various compositions in selective solvent mixtures are studied by viscometry, equilibrium dialysis, differential refractometry and light scattering The addition of ethanol as a selective precipitant to a dioxan solution of SBS leads to selective precipitation of butadiene blocks which are kept in solution by solvated styrene blocks Under the given conditions (temperature, copolymer composition, mixed solvent composition) the forming micelles attain, at a certain copolymer concentration, a stable weight The results of measurements show that the micelles are very small particles (radius of gyration up to 20nm) of a high weight (up to 15·106); consequently, the average volume fraction of the polymer in the space occupied by a micelle attains unusually large values (up to 035)
Verdunnte Losungen von Styrol/Butadien/Styrol-Blockcopolymeren (SBS) in selektiven Losungsmittelgemischen werden mit Hilfe der Viskosimetrie, Gleichgewichtsdialyse, Differentialrefraktometrie und Lichtstreuung untersucht Durch Zugabe von Athanol (als selektives Fallungsmittel) zu Dioxanlosungen von SBS werden die Butadienblocke selektiv gefallt; durch solvatierte Styrolblocke werden sie jedoch in Losung gehalten Die entstehenden Micellen erreichen unter den gegebenen Bedingungen (Temperatur, Zusammensetzung des Copolymerisats und des Losungsmittelgemisches) bei einer bestimmten kritischen Konzentration des Copolymerisats ein stabiles Teilchengewicht Die Mesergebnisse zeigen, das die gebildeten Micellen sehr kleine Teilchen (Tragheitsradius unter 20 nm) mit hohen Teilchengewichten (bis 15·106) und grosen Volumenbruchen des Polymeren in der Micelle (bis 0,35) sind
23 citations