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.

A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior

Abstract: A study of the thermal behavior of cured elastomeric blends of natural rubber (NR) and styrene butadiene rubber (SBR) prepared by solution blending in toluene is presented. Binary blends with different compositions of NR/SBR were produced using a conventional cure system based on sulfur and TBBS (n-t-butyl-2-benzothiazole sulfonamide as accelerator. The compounds were vulcanized at 433 K up to an optimum time of cure determined by rheometric tests. From swelling tests, the crosslink densities of the compounds were obtained and compared with those obtained in similar blends prepared by mechanical mixing. The results were analyzed in terms of the disentangling of the chain structures of the SBR and NR phases and the achieved cure state of the blend. Using differential scanning calorimetry, the glass transition temperature Tg of each blend was measured. In most compounds, the value of Tg corresponding to each phase of the blend was determined, but in some blends a single value of Tg was obtained. The variation of Tg with the composition and cure level in each phase was analyzed. On the other hand, a physical mixture of two equal parts of NR and SBR vulcanized was measured and the results were compared to those of the NR50/SBR50 cured blend. Besides, to analyze the influence of the network structure, pure NR and SBR unvulcanized samples were measured. On the basis of all the obtained results, the influence of the interphase formed in the blend between SBR and NR phases is discussed. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Performance prediction analyses of styrene-butadiene rubber and crumb rubber materials in asphalt road applications

Abstract: One of the very popular techniques of improving asphalt pavement performance is the use of rubber materials as modifiers in the mix. Although rubber modification of asphalt binder has been found to be a promising technique towards improving the performance of asphalt mixtures, an insight impact of locally available rubber materials on asphalt mix performance is yet a research problem. Thus, it is important to investigate the effect of locally available rubber-modifiers on asphalt mixes chiefly to be able to prescribe and recommend the optimal percent of rubber materials in the preparation of durable rubber-modified asphalt mixtures. Thus, the main objective of this study was to investigate the performance of rubber-modified asphalt mixtures, and help recommend the optimal dosage of rubber materials in the asphalt mix to be able to use locally available rubber products in durable asphalt roads. Asphalt mixtures with gap-graded gradation and varying rubber dosages namely 10, 15, and 20 % were manufactured. Fatigue life estimations indicated that 15 % rubber by weight of the base binder provided excellent fatigue performance. Also, rubber-modified asphalt mixture materials produced lower accumulated strain than the conventional mix due to enhanced endurance properties of the rubber-modification. Although 10 % rubber dosage was found to be higher rut-resistant, 15 % rubber composite material was recommended mainly to have a common ground to counter fatigue and rutting distresses simultaneously. Thus, this study showed that locally available rubber materials are very promising candidates to serve as alternatives to the commercially available modified binders used in asphalt roads.

Film/substrate composite material

Abstract: A composite useful for making trays for the packaging of food and the like is formed from foamed polystyrene and a film bonded to the polystyrene, the film including a bonding layer of a styrene butadiene copolymer, the bonding layer including at least about 25% by weight of butadiene. The composite may be thermoformed into articles such as trays for use in the packaging of food products, especially meat products.