Styrene butadiene rubber (SBR) is a synthetic rubber derived from styrene and butadiene monomers. It can be produced through emulsion polymerization or solution polymerization. SBR has good abrasion resistance and aging stability when protected by additives. Approximately 50% of car tires are made from various types of SBR. It finds applications in tires, shoe soles, gaskets, and chewing gum due to its properties.

1. Styrene Butadiene Rubber
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2. 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
various types of SBR
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3. 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.
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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4. 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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5. Structure of Styrene-Butadiene:
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6. Molecular Formula:
C12 H14 Given That:
C=12g/mol , H=1g/mol
The Molecular Weight=
(12*12)+(1*14)
=158g/mol
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7. Chemical Reaction:
Conditions:
• The ratio of butadiene to styrene is mostly
76.5% to 23.5% by weight.
• Temperature is normally about 50OC or
even higher.
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8. Calculations:
n: Number Of Polymers Let n=100
Then 100*158= 15800 g/mol
To Produce 100 Ton/Day
C4H6 + C8H8 C12H14
288 104 15800
X Y 100*106
X= [(100*106 )*288]/15800 = 1.8*106 g/day
Y= [(100*106 )*104]/104= 658.2*103 g/day
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9. Flow Sheet:
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