Styrene butadiene rubber

Sythensis Of Styrene Butadiene Rubber

1. Table Of Contents Introduction. 1 The Molecular Formula. 2 Production. 3 Types Of SBR. 4 Buna S. 4 Properties Of SBR. 5 Appilications . 6 Flow Sheet. 7 Made By Kareem Tharaa 1 22-Dec-13

2. I.Introduction : Styrene-butadiene or styrene-butadiene rubber (SBR) describe families of synthetic rubbers derived from styrene and butadiene. These materials have  good abrasion resistance and good aging stability when protected by additives. About 50% of car tires are made from types of SBR. The styrene/butadiene ratio influences the properties of the polymer: with high styrene content, the rubbers are harder and less rubbery. Made By Kareem Tharaa 2 22-Dec-13

3. II.The Molecular Formula : Made By Kareem Tharaa 3 22-Dec-13

4. III.Production : From ethanol In other parts of the world, including South America, Eastern Europe, China, and India, butadiene was also produced from ethanol. While not competitive with steam cracking for producing large volumes of butadiene, lower capital costs make production from ethanol a viable option for smaller-capacity plants. Two processes were in use. In the single-step process developed by Sergei Lebedev , ethanol is converted to butadiene, hydrogen, and water at 400–450 °C over any of a variety of metal oxide catalysts . 2  CH 3 CH 2 OH → CH 2 =CH-CH=CH 2  + 2 H 2 O +  H 2

5. IV.Types of SBR: SBR is derived from two monomers, styrene and butadiene. The mixture of these two monomers are polymerized by two basically different processes: from solution (S-SBR) or as an emulsion (E-SBR). Emulsion polymerization: E-SBR produced by emulsion polymerization is initiated by free radicals. 2. Solution polymerization Solution-SBR is produced by an anionic polymerization process. V.Buna S: The material was initially marketed with the brand name  Buna S . Its name derives Bu for butadiene and Na for sodium (natrium in several languages including Latin, German and Dutch), and  S  for styrene . Made By Kareem Tharaa 5 22-Dec-13

6. VI.The Properties Of SBR: Property E-SBR Tensile Strength 19 Elongation at tear 635 Glass Transition Temperature -50 Property S-SBR Tensile Strength 18 Elongation at tear 565 Glass Transition Temperature -65 Made By Kareem Tharaa 6 22-Dec-13

7. VII.Applications : The elastomer is used widely in pneumatic tires, shoe heels and soles, gaskets and even chewing gum. It is a commodity material which competes with natural rubber. Latex (emulsion) SBR is extensively used in coated papers, being one of the most cost-effective resins to bind pigmented coatings. It is also used in building applications, as a sealing and binding agent behind renders as an alternative to PVA, but is more expensive. Made By Kareem Tharaa 7 22-Dec-13

8. VIII.Flow Sheet: