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By far the most widely used type of synthetic rubber, Butadlene Styrene Rubber Sks-30 Sbr-1502's consumption for all applications is four times that of polybutadiene, its nearest competitor, and 1.5 times that of all other elastomers combined.
Butadlene Styrene Rubber Sks-30 Sbr-1502's manufacture involves copolymerization of three parts butadiene with one part styrene.
These materials are suspended in finely divided emulsion form in a large proportion of water, in the presence of a soap or detergent.
CAS: 9003-55-8
MF: (C8H8.C4H6)x
MW: 158.24
EINECS: 618-370-2
Synonyms: 1,3-BUTADIENE/STYRENE COPOLYMERS;Styrene-butadiene rubber,oil-extended;Styrene-butadiene-styrene block copolymer;sd345(polymer);sd354;sks85;soilstabilizer661;solprene300
Also present in small amounts are an initiator or catalyst which is usually a peroxide, and a chain-modifying agent such as dodecyl mercaptan.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is a polymer.
Butadlene Styrene Rubber Sks-30 Sbr-1502 describe families of synthetic rubbers derived from styrene and butadiene (the version developed by Goodyear is called Neolite).
These materials have good abrasion resistance and good aging stability when protected by additives.
In 2012, more than 5.4 million tonnes of Butadlene Styrene Rubber Sks-30 Sbr-1502 were processed worldwide.
About 50% of car tires are made from various types of Butadlene Styrene Rubber Sks-30 Sbr-1502.
The styrene/butadiene ratio influences the properties of the polymer: with high styrene content, the rubbers are harder and less rubbery.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is not to be confused with the thermoplastic elastomer, styrene-butadiene block copolymer, although being derived from the same monomers.
Butadiene-styrene copolymer (CAS 9003-55-8), commonly known as Butadlene Styrene Rubber Sks-30 Sbr-1502, is a thermoplastic elastomer that combines the properties of rubber and plastic.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is synthesized through the copolymerization of styrene and butadiene, resulting in a material that exhibits excellent elasticity, resilience, and flexibility.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is characterized by its high tensile strength and good abrasion resistance, making it suitable for various applications, including adhesives, sealants, and coatings.
The copolymer's structure consists of hard polystyrene domains that provide strength and soft polybutadiene segments that impart elasticity.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is also known for its compatibility with other polymers and additives, enhancing its versatility in formulations.
Additionally, Butadlene Styrene Rubber Sks-30 Sbr-1502 has good thermal stability and can be processed using standard thermoplastic techniques, such as extrusion and injection molding.
However, Butadlene Styrene Rubber Sks-30 Sbr-1502 is sensitive to UV light and can degrade over time when exposed to harsh environmental conditions, necessitating the use of stabilizers or protective coatings in certain applications.
History
Butadlene Styrene Rubber Sks-30 Sbr-1502 is a replacement for natural rubber.
Butadlene Styrene Rubber Sks-30 Sbr-1502 was originally developed prior to World War II in Germany by chemist Walter Bock in 1929.
Industrial manufacture began during World War II, and was used extensively by the U.S.
Synthetic Rubber Program to produce Government Rubber-Styrene (GR-S) to replace the Southeast Asian supply of natural rubber which, under Japanese occupation, was unavailable to Allied nations.
Butadlene Styrene Rubber Sks-30 Sbr-1502 Chemical Properties
Melting point: 253 °C
density: 1.04 g/mL at 25 °C
refractive index: 1.57
solubility: solvents with solubility parameters between 7.7 and 9.4: soluble
form: slab/chunk
Stability: Stable. Combustible. Incompatible with strong oxidizing agents.
Cosmetics Ingredients Functions: OPACIFYING
InChI: InChI=1S/C8H8.C4H6/c1-2-8-6-4-3-5-7-8;1-3-4-2/h2-7H,1H2;3-4H,1-2H2
InChIKey: MTAZNLWOLGHBHU-UHFFFAOYSA-N
LogP: 2.700 (est)
IARC: 3 (Vol. 19, Sup 7) 1987
EPA Substance Registry System: Butadlene Styrene Rubber Sks-30 Sbr-1502 (9003-55-8)
Uses
Molded or extruded into toys, packaging, appliances, communication cassettes, dinnerware and serviceware.
Component of hot melt adhesives, sealants, asphalt and oil gels.
Modifier for polymers, thermosets and general rubber compounding.
Direct molded or extruded auto parts, sporting goods, footware and film.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is a commodity material which competes with natural rubber.
The elastomer is used widely in pneumatic tires.
This application mainly calls for E-SBR, although Butadlene Styrene Rubber Sks-30 Sbr-1502 is growing in popularity.
Other uses include shoe heels and soles, gaskets, and even chewing gum.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is extensively used in coated papers, being one of the cheapest resins to bind pigmented coatings.
In 2010, more than half (54%) of all used dry binders consisted of SB-based latexes.
This amounted to roughly 1.2 million metric tons (1.3 million short tons).
Butadlene Styrene Rubber Sks-30 Sbr-1502 is also used as a binder in lithium-ion battery electrodes, in combination with carboxymethyl cellulose as a water-based alternative for, e.g. polyvinylidene fluoride.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is also used in gasketed-plate heat exchangers.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is used at moderate temperature up to 85 °C (185 °F; 358 K) for aqueous systems.
Production Methods
Butadlene Styrene Rubber Sks-30 Sbr-1502 is prepared mainly by emulsion and solution polymerization in a free-radical process with a mercaptan, such as dodecylmercaptan, which is used as a chain-transfer agent to control molecular weight.
In the emulsion process, a soapstabilized water emulsion of styrene and butadiene is polymerized in continuous reactors to form Butadlene Styrene Rubber Sks-30 Sbr-1502 elastomer.
“Cold” Butadlene Styrene Rubber Sks-30 Sbr-1502 is produced at a temperature of 5–10°C, and “hot” SBR at about 50°C.
Butadlene Styrene Rubber Sks-30 Sbr-1502 is typically made in hydrocarbon solution with an n-butyllithium initiator.
The major differences between emulsion and solution Butadlene Styrene Rubber Sks-30 Sbr-1502 are in the linearity and molecular-weight distribution of the polymer chains.
In nonpolar solvents, the tendency is to produce block copolymer, but random copolymers are formed in polar solvents.
Butadlene Styrene Rubber Sks-30 Sbr-1502 can be vulcanized similar to natural rubber but generally requires less sulfur and is more accelerated because of its lowunsaturation.
Health Hazard
Butadlene Styrene Rubber Sks-30 Sbr-1502 is prepared in large quantities for tire treads and other, similar uses.
The properties, molecular weight, and percentage of monomer can all be controlled in the polymerization process.
Hazards of the Butadlene Styrene Rubber Sks-30 Sbr-1502 industry have been identified and related mostly to the monomers and additives.
Contact dermatitis and leukemia have been associated with solvent and additive use but not with the actual polymer itself (Checkoway et al., 1984; Kilpikari, 1982).
Epidemiological studies in the industry have not revealed a significant increase in disease or causes of death (Matanoski and Schwartz, 1987; Meinhardt et al., 1982).
The hazards of the butadiene and styrene monomers were discussed previously.
Types
Butadlene Styrene Rubber Sks-30 Sbr-1502 is derived from two monomers, styrene and butadiene.
The mixture of these two monomers is polymerized by two processes: from solution (S-SBR) or as an emulsion (E-SBR).
Butadlene Styrene Rubber Sks-30 Sbr-1502 is more widely used.
Emulsion polymerization
Butadlene Styrene Rubber Sks-30 Sbr-1502 produced by emulsion polymerization is initiated by free radicals.
Reaction vessels are typically charged with the two monomers, a free radical generator, and a chain transfer agent such as an alkyl mercaptan.
Radical initiators include potassium persulfate and hydroperoxides in combination with ferrous salts.
Emulsifying agents include various soaps.
By "capping" the growing organic radicals, mercaptans (e.g. dodecylthiol), control the molecular weight of the product.
Typically, polymerizations are allowed to proceed only to ca. 70%, a method called "short stopping".
In this way, various additives can be removed from the polymer.
Solution polymerization
Butadlene Styrene Rubber Sks-30 Sbr-1502 is produced by an anionic polymerization process.
Polymerization is initiated by alkyl lithium compounds.
Water and oxygen are strictly excluded.
The process is homogeneous (all components are dissolved), which provides greater control over the process, allowing tailoring of the polymer.
The organolithium compound adds to one of the monomers , generating a carbanion that then adds to another monomer, and so on.
For tire manufacture, Butadlene Styrene Rubber Sks-30 Sbr-1502 is increasingly favored because it offers improved wet grip and reduced rolling resistance, which translate to greater safety and better fuel economy, respectively.
