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.

Synthesis and Characterization of Styrene-Butadiene Rubber-Clay Nanocomposites with Enhanced Mechanical and Gas Barrier Properties

Abstract: Five styrene-butadiene rubber (SBR)/clay nanocomposite or hybrid systems were synthesized via mechanical mixing of SBR using a Brabender mixer and a 2-roll mill in the presence of unmodified sodium montmorillonite (Na-MMT) clay, MMT modified with octadecylamine (C18amine), MMT modified with a zwitterionic surfactant, octadecyldimethyl betaine (C18DMB), and MMT modified with a polymerizable cationic surfactant, vinylbenzyl octadecyldimethyl ammonium chloride (VODAC) or vinylbenzyl dodecyldimethyl ammonium chloride (VDAC). The surfactant chain length and functional groups affected the dispersion of clay nanolayers in the matrix and the overall properties of the nanocomposites. X-ray diffraction (XRD) revealed peaks corresponding to intercalated structures; transmission electron microscopy (TEM) observations agreed well with XRD assessment of the composites. SBR/VODAC-MMT system exhibited the best dispersion among the nanocomposites studied. VODAC-MMT was partially exfoliated in SBR matrix and the a...

Secondary battery with non-aqueous solvent

Abstract: PURPOSE: To equip a secondary battery with excellent charge/discharge cyclic life and a high rate of capacity retention by using carboxymethylcellulose and styrene butadiene rubber as a bonding agent for a negative electrode body. CONSTITUTION: A negative electrode body 5 consisting of a carbonaceous substance as a sintered body of an organic compound and Li or a Li-based alkali metal which is borne by this carbonaceous substance, a separator 6, and a positive electrode body 7 whose active substance is Li-containing composite oxide are put one over another consolidatedly in the sequence as named, and thus a non-aqueous solvent secondary battery 1 is constructed. Carboxymethyle cellulose and styrene butadiene rubber are used as a bonding agent for the negative electrode body 4. COPYRIGHT: (C)1992,JPO&Japio

Effect of styrene-butadiene-styrene block copolymer on fatigue crack propagation behavior of asphalt concrete mixtures

Abstract: The effect of styrene-butadiene-styrene (SBS) additive percentage on the fatigue crack propagation behavior of AC-5 asphalt concrete mixture was studied. Beams were prepared from AC-5 asphalt binder containing 6, 10, and 15% SBS by weight. Flexural fatigue tests were conducted on three identical specimens at each additive percentage. Parameters controlling the crack propagation process were evaluated--namely, the energy release rate and the change in work expended on damage formation and history-dependent viscous dissipation processes. The modified crack layer model was used to extract the specific energy of damage characteristic of the mixture's resistance to crack propagation and the dissipative coefficient. It has been found that the 15% SBS mixture displayed superior fracture toughness as reflected in the specific energy of damage and the dissipative coefficient. As the additive percentage was increased, the fracture toughness of the mixture increased. Also, the ultimate strength and modulus increased. Within the range of additive percentage tested it appears that both the polystyrene endblocks and butadiene rubbery midblocks are working together to improve the ultimate strength and fracture toughness of the asphalt concrete mixture. Scanning electron microscope examination revealed an obvious change in the morphology of the fracture surface as the percentage of additive in the binder increased. This change is manifested in ridge formation in the binder-rich areas of the mixture. This change is also indicative of better adhesion between the binder and the aggregate as well as better cohesion within the binder, which in turn contributes to the increased toughness of the asphalt concrete mixture.

Dynamic mechanical properties of styrene butadiene rubber and poly (ethylene-co-vinyl acetate) blends

Abstract: The dynamic mechanical behaviour of uncrosslinked and crosslinked styrene butadiene rubber/poly (ethylene-co-vinyl acetate) (SBR/EVA) blends was studied with reference to the effects of blend ratio, crosslinking systems, a compatibilizer viz. maleic-anhydride grafted poly [styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS-g-MA), frequency and temperature. The two separate tan δ peaks, obtained during DMA, indicated the immiscibility of SBR/EVA system. The damping properties increased with SBR content for uncrosslinked and crosslinked blends. In the case of crosslinked systems, depending upon the type of crosslinking agent used, the glass transition temperature (T g) of SBR phase has been found to be shifted to higher temperatures. The damping characteristics of the blends were observed to be affected by the variations in frequency. The addition of the compatibilizer improved the storage modulus and reduced the damping properties. These results have been correlated with the morphology of the blends, attested by scanning electron micrographs. The activation energy for glass transition has been computed. The experimental data on storage modulus were compared with theoretical predictions.