Styrene-butadiene rubber (SBR) is a synthetic rubber derived from styrene and butadiene monomers. There are two main types: emulsion SBR produced via emulsion polymerization, and solution SBR produced via anionic polymerization. SBR has good abrasion resistance and aging stability when protected by additives. Approximately 50% of car tires are made from SBR, with higher styrene content rubbers being harder and less rubbery. Common applications of SBR include use in car tires, shoe soles, gaskets, and coated papers.

1. Table Of Contents
I. Introduction. 1
II. The Molecular Formula. 2
III. Production. 3
IV. Types Of SBR. 4
V. Buna S. 4
VI. Properties Of SBR. 5
VII.Appilications. 6
VIII.Flow Sheet. 7
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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.
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3. II.The Molecular Formula :
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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 CH3CH2OH → CH2=CH-CH=CH2 + 2 H2O + H2

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).
1. 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.
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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
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7. VII.Applications:
1. The elastomer is used widely in
pneumatic tires, shoe heels and
soles, gaskets and even chewing gum.
2. It is a commodity material which competes
with natural rubber.
3. Latex (emulsion) SBR is extensively used
in coated papers, being one of the most cost-effective
resins to bind pigmented coatings.
4. It is also used in building applications, as a
sealing and binding agent behind renders as an
alternative to PVA, but is more expensive.
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8. VIII.Flow Sheet: