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 authors presented the preparation of novel thermoplastic composites elastomer material based on poly (styrene-butadiene-styrene) (SBS), ester-type polyurethane (TPU-EX) and TPU-ER materials via melt blending.
55 citations
TL;DR: In this paper, the authors explored the possibility of using silica from fly-ash particles as reinforcement in natural rubber/styrene-butadiene rubber (NR/SBR) vulcanizates.
Abstract: This article explored the possibility of using silica from fly-ash particles as reinforcement in natural rubber/styrene–butadiene rubber (NR/SBR) vulcanizates. For a given silica content, the NR : SBR blend ratio of 1 : 1 (or 50 : 50 phr) exhibited the optimum mechanical properties for fly-ash filled NR/SBR blend system. When using untreated silica from fly-ash, the cure time and mechanical properties of the NR/SBR vulcanizates decreased with increasing silica content. The improvement of the mechanical properties was achieved by addition of Si69, the recommended dosage being 2.0 wt % of silica content. The optimum tensile strength of the silica filled NR/SBR vulcanizates was peaked at 10–20 phr silica contents. Most mechanical properties increased with thermal ageing. The addition of silica from fly-ash in the NR/SBR vulcanizates was found to improve the elastic behavior, including compression set and resilience, as compared with that of commercial precipitated silica. Taking mechanical properties into account, the recommended dosage for the silica (FASi) content was 20 phr. For more effective reinforcement, the silica from fly-ash particles had to be chemically treated with 2.0 wt % Si69. It was convincing that silica from fly-ash particles could be used to replace commercial silica as reinforcement in NR/SBR vulcanizates for cost-saving and environment benefits. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007
55 citations
TL;DR: In this paper, the flex-fatigue life of carbon-black-filled SBR was dramatically improved by incorporation of 4-5 phr nanodispersed clay layers, which improved the hysteresis and tearing energy.
Abstract: Summary: The flex-fatigue life of carbon-black-filled SBR was dramatically improved by incorporation of 4–5 phr nanodispersed clay. Addition of clay did not decrease the degree of crosslinking of the composite but improved the hysteresis and tearing energy. ESEM observation of the flexing-fracture morphology indicated that nanodispersed clay layers had the advantage over carbon black in that they could blunt the crack.
Effect of the clay amount on the flex fatigue life of the composites.
55 citations
TL;DR: In this article, the mutual influence between polypropylene (PP) and polystyrene (PS) polymer blend components during UV photodegradation was studied, and it was shown that PS absorbs UV light and energy is transferred to PP, which produces more reactive tertiary carbon free radicals.
55 citations
TL;DR: In this paper, an elastomer (radial styrene butadiene styrene, SBS) and a plastomer polymer (ethyl vinyl acetate, EVA) were mixed with one base bitumen at three polymer concentrations to investigate the changes in the morphology and rheological response of polymer modified bitumens used in road pavement construction caused by ageing.
Abstract: Polymer additives are used to improve the properties of road bitumens including their oxidative resistance. However, their usage as anti-oxidative materials remains relatively unclear. This study aims to investigate the changes in the morphology and the rheological response of polymer modified bitumens used in road pavement construction caused by ageing. An elastomer (radial styrene butadiene styrene, SBS) and a plastomer (ethyl vinyl acetate, EVA) polymer were mixed with one base bitumen at three polymer concentrations. The bitumens were RTFO and PAV aged. The morphology of the bitumens was captured by fluorescence microscopy while the rheological properties were measured by means of the multiple stress creep and recovery (MSCR) test. The results show that the morphology of the SBS modified bitumen degrades with ageing as a function of polymer concentration and dispersion, with higher dispersion being more resistant. The morphology of the EVA modified bitumen has a low ageing susceptibility irrespective of polymer concentration. The MSCR response of EVA modified bitumens does not differ from that found for unmodified bitumen, where the hardening produces a decrease in the non-recoverable compliance. In the case of SBS modified bitumen, the degradation of the polymer backbone affects the bitumen hardening as much as the polymer phase dispersed and networked in the bitumen phase. Furthermore, in the case of the elastomer, the average percent recovery is in agreement with the variation of the morphology with ageing. Therefore, the use of the average percent recovery as a valuable rheological index of the integrity of the polymer network can be advocated.
55 citations