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Styrene-butadiene : ウィキペディア英語版
Styrene-butadiene

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Styrene-butadiene or styrene-butadiene rubber (SBR) 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 SBR were processed worldwide. 〔Market Study Synthetic Rubber(), published by Ceresana, June 2013〕 About 50% of car tires are made from various types of SBR. The styrene/butadiene ratio influences the properties of the polymer: with high styrene content, the rubbers are harder and less rubbery.〔Werner Obrecht, Jean-Pierre Lambert, Michael Happ, Christiane Oppenheimer-Stix, John Dunn and Ralf Krüger "Rubber, 4. Emulsion Rubbers" in Ullmann's Encyclopedia of Industrial Chemistry, 2012, Wiley-VCH, Weinheim. 〕 SBR is not to be confused with a thermoplastic elastomer made from the same monomers, styrene-butadiene block copolymer.
==Types of SBR==
SBR 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).〔(International Institute of Synthetic rubber Producers, Inc. (IISRP) ) article on S-SBR (retrieved 2011-12-02)〕 E-SBR is more widely used.

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