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 diffusion, solution, and permeation behavior of a series of inert gases (helium, argon, nitrogen, krypton, and xenon) in S-B block copolymer films was studied by transient permeability measurements and by the equilibrium desorption method.
Abstract: The diffusion, solution, and permeation behavior of a series of inert gases (helium, argon, nitrogen, krypton, and xenon) in S-B block copolymer films was studied by transient permeability measurements and by the equilibrium desorption method. The morphologies of most of the samples used in the measurements were (a) polystyrene rods dispersed in a polybutadiene matrix and (b) alternating lamellae of styrene and butadiene components. It was indicated, as far as the kinetic nature at lower temperatures is concerned, that the diffusion and permeation processes of gases, except for helium, are governed primarily by behavior in the polybutadiene matrix. At lower temperatures, it was shown that the transient method counts only the mobile penetrant in the polybutadiene matrix, while the equilibrium method counts less diffusive species in the polystyrene domains as well. The diffusion behavior in the copolymer films was compared with that in homopolybutadiene and discussed in terms of two impedance factors: the tortuosity and the chain immobilization factors. From the homopolymer-block copolymer comparison along with results obtained from diffusion experiments using n-hexane as the penetrant, it was indicated that segmental motions in the polybutadiene phase in the copolymers are restricted relative to motions in homopolybutadiene. Also, from data on gas sorption in samples of various styrene contents, involving both S-B block copolymers and binary mixtures with homopolystyrene, it was suggested that the partial mixing of component block chains occurs at the interface between the domains, resulting in rather diffuse domain boundaries.
23 citations
TL;DR: In this paper, pyrolytic coconut shell char is used to evaluate its potential as a sustainable and renewable substitute filler for carbon black in rubber, which is the most widely used filler in rubber.
Abstract: This paper presents research undertaken on pyrolytic coconut shell char to evaluate its potential as a sustainable and renewable substitute filler for carbon black in rubber. Carbon black is the most widely used filler in rubber. Its manufacture from nonrenewable feedstock is unsustainable and energy-consuming and contributes significantly to global CO2 emissions. The pyrolytic properties of coconut shell were evaluated; response surface methodology was applied to model the relationship between the pyrolysis conditions and char properties. Coconut shells were pyrolyzed using a laboratory-scale furnace under various temperatures (400–800 °C), residence times (0–2 h), and atmospheric flow rates. Comparisons were made between the char and commercial carbon blacks for their physical and chemical properties (surface area and pH). Comparable char pH and surface area properties were achieved (optimal char exhibited 300 m2/g surface area). Selected samples were tested in-rubber, with the performance of the filled...
23 citations
TL;DR: In this paper, Eucommia ulmoides gum (EUG) was incorporated into styrene-butadiene rubber (SBR) to prepare sound absorption materials, and the morphology, crystalline structure, and macro-performance of the as-produced composites were systemically investigated.
23 citations
TL;DR: The effect of particle size and dispersion of such nanofillers on thermomechanical properties and curing characteristics were investigated in this paper, where after-hatching eggshell (AHES) nanobiofiller and nanocalcium carbonate (nano-CA) were separately added to various elastomers, such as acrylonitrile butadiene rubber (NBR), styrene and rubber (SBR), and natural rubber (NR), in various amounts of 5, 10, and 15 phr.
Abstract: After-hatching eggshell (AHES) nanobiofiller and nanocalcium carbonate (nano-CA) were separately added to various elastomers, such as acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), and natural rubber (NR), in various amounts of 5, 10, and 15 phr. The effect of particle size and dispersion of such nanofillers on thermomechanical properties and curing characteristics were then investigated. The ultimate tensile properties of SBR and NR nanocomposites were improved to some extent when 5 phr of AHES nanofiller was added to the rubber compound compared to CA. In the case of NBR nanocompounds, however, the mechanical properties were seemingly comparable, irrespective of the type of nanofiller. This contradictive behavior could be attributed to the alteration of crosslink density due to particular filler–matrix interaction while using mineral and natural fillers. The results of the rheometric study revealed that using AHES rather than CA slightly increases the scorch time of all types of prepared nanocomposites, whereas a significant drop in the optimum curing time was seen for NBR nanocomposites containing AHES biofiller. Moreover, thermogravimetric analysis showed similar thermal stability for SBR nanocomposites containing AHES and CA fillers. Finer particle size of CA and higher porosity of AHES at high and low loading levels were respectively the main reasons for improvement of ultimate properties. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
23 citations