BR
Polybutadiene Rubber
Glass Transition (Tg)
-100 to -95 °C
Melting Point (Tm)
—
Density
0.91 g/cm³
CAS Number
9003-17-2
Recycling Code
None
Category
Elastomer
Repeat Unit
–[CH₂–CH=CH–CH₂]ₙ–
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Lowest Tg of common rubbers giving superb low-temperature flexibility and rebound; poor tear strength so it is nearly always blended.
Applications
Tyre sidewalls, golf-ball cores, HIPS/ABS impact modifier.