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 article, a 40 phr carbon-black filled styrene butadiene rubber has been submitted to several experiments in order to identify the physical damage responsible for the mechanical softening recorded upon first stretch.
53 citations
TL;DR: In this article, the characterization of styrene-butadiene-styrene (SBS) block copolymers at molecular level through different techniques was dealt with, such as Gel Permeation chromatography (GPC) in tetrahydrofuran (THF) solvent and using a calibration curve based on mono-dispersed polystyrene standards; the relative molecular weights obtained by GPC were adjusted using a correction factor based on Mark-Houwink-Sakurada parameters for SBS in THF.
Abstract: This paper deals with the characterization of styrene-butadiene-styrene (SBS) block copolymers at molecular level through different techniques. SBS molecular weight distributions (MWD) were measured by Gel Permeation chromatography (GPC) in tetrahydrofuran (THF) solvent and using a calibration curve based on mono-dispersed polystyrene standards; afterwards, the relative molecular weights obtained by GPC were adjusted using a correction factor based on Mark-Houwink-Sakurada parameters for SBS in THF. Quantitative characterization of polybutadiene (PB) structures in SBS was made by solid-state 13C Nuclear Magnetic Resonance (NMR). A novel method using Fourier transform infrared spectroscopy (FTIR) has been developed for characterizing the SBS composition. This method covers the determination of composition in SBS ranging from 20 to 75 wt% of polybutadiene (PB) and was performed based on a FTIR calibration curve, which was prepared using mixtures of polystyrene (PS) and polybutadiene (PB) of known compositions.
53 citations
TL;DR: In this paper, styrene butadiene rubber (SBR) was devulcanized using microwave irradiation and the effect of ionic liquid (IL), pyrrolidinium hydrogen sulfate [Pyrr][HSO4] on the performance was studied.
Abstract: In this study, styrene butadiene rubber (SBR) was devulcanized using microwave irradiation. In particular, effect
of ionic liquid (IL), pyrrolidinium hydrogen sulfate [Pyrr][HSO4], on the devulcanization performance was studied. It was
observed that the evolution of the temperature reached by rubber powder exposed to microwave irradiation for different
energy values was favored by the presence of ionic liquid [Pyrr][HSO4] significantly over the whole range of the
microwave energy values. Beyond the threshold point of 220 Wh/kg, the soluble fraction after devulcanization sharply
increased with increasing devulcanization microwave energy. For the powder mixed with [Pyrr][HSO4], the increase was
more significant. Furthermore, the crosslink density was observed to decrease slowly with the microwave energy up to
220 Wh/kg, beyond which the crosslink density decreased significantly for the rubber impregnated with IL. For the rubber
with IL, significant and continuous increase in Tg with microwave energy values was observed in comparison with the SBR
where no change in transition temperature was observed. Mechanical shearing of rubber gums in the two-roll mill favored
the devulcanization process, which indicated that the combination of mechanical loading with microwave energy and IL is
an efficient procedure allowing an optimal devulcanization of rubbers.
53 citations
TL;DR: In this paper, the authors demonstrate a new approach where in situ polymerization of monomers bis(2-hydroxyethyl) terephthalamide (BHETA) with diphenylmethane-diisocyanate (MDI) in the body of bitumen for the development of polyurethane based polymer modified bitumen, which is comparable performance under laboratory condition with conventional styrene butadiene styrene (SBS) based PMB.
53 citations
TL;DR: In this paper, a combination of methods was utilized for the distribution analyses of the acid in styrene/butadiene copolymer latexes with varying concentrations of acrylic acid at a constant degree of neutralization.
53 citations