1, 3 Butadiene is Polymerized to form Polybutadiene
A synthetic rubber is
polybutadiene. The monomer 1,3-butadiene is polymerized to create the polymer
known as polybutadiene rubber. Since tyres account for around 70% of
production, polybutadiene is used in particular there because of its great
resistance to wear. To increase the durability of polymers like polystyrene and
acrylonitrile butadiene styrene, further 25% is added (ABS). In 2012, nearly
25% of the total global use of synthetic rubbers was made up of polybutadiene
rubber.
Over 70% of the polymer produced
is used in treads and sidewalls of tyres, which is where polybutadiene is
mostly used. Due to its low glass transition temperature, cured BR has
excellent abrasion resistance (good tread wear) and low rolling resistance
(good fuel economy) (Tg). The low "vinyl" content of polybutadiene,
which will be addressed later, is the cause of the low Tg, which is typically -90C.
For tread compounds, polybutadiene is typically combined with other elastomers
like natural rubber or styrene-butadiene rubber because low Tg also results in
poor wet traction capabilities.
Rarely used alone, polybutadiene
rubber is typically combined with other rubbers. In a two roll mixing
mill, it is difficult to band polybutadiene. Instead, a thin polybutadiene
sheet might be manufactured and stored separately. After the natural rubber has
been properly masticated, the polybutadiene rubber can then be added to the
two-roll mixing mill. For instance, if polybutadiene is to be combined with
styrene butadiene rubber, a similar procedure may be used (SBR). * As an impact
modifier, styrene may be used with polybutadiene rubber. Styrene's clarity may
be affected by high dosages.
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