| Formula / Notation | (C4H6)n |
|---|---|
| CAS Number | 9003-17-2 |
| Molecular Weight | Variable (polymer) |
| Melting Point | Glass transition: −105 °C |
| Boiling Point | Decomposes |
| Density | 0.90 g/cm³ |
| Solubility | Insoluble in water |
| Appearance | pale yellow elastomeric solid |
| Also Known As | BR; butadiene rubber; buna rubber |
| Category | Polymers & Plastics |
What is Polybutadiene?
Polybutadiene (BR) is a synthetic rubber produced by polymerisation of 1,3-butadiene. It has the highest resilience and lowest glass transition temperature (−105 °C) of any synthetic rubber, making it particularly useful in applications requiring good elasticity at low temperatures. It is primarily used as a component in tyre manufacture (blended with natural rubber and SBR) and as an impact modifier for plastics such as polystyrene and ABS.
Formula & Notation
IUPAC Name: poly(1,3-butadiene)
Other Names / Synonyms: BR; butadiene rubber; buna rubber
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | Glass transition: −105 °C |
| Boiling Point | Decomposes |
| Density | 0.90 g/cm³ |
| Molecular Weight | Variable (polymer) |
| Solubility | Insoluble in water |
| Appearance | pale yellow elastomeric solid |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Polybutadiene (BR) is a synthetic rubber produced by polymerisation of 1,3-butadiene. It has the highest resilience and lowest glass transition temperature (−105 °C) of any synthetic rubber, making it particularly useful in applications requiring good elasticity at low temperatures. It is primarily used as a component in tyre manufacture (blended with natural rubber and SBR) and as an impact modifier for plastics such as polystyrene and ABS.
Tyre manufacture (primary use — ~70% of production). Golf ball cores. Impact modifier for HIPS and ABS plastics. Conveyor belts and industrial hoses. Shoe soles.
Low acute toxicity in cured form. Releases toxic fumes including 1,3-butadiene (probable human carcinogen) when burned. Uncured rubber can be a skin sensitiser. Consult SDS before processing.
The formula or notation for Polybutadiene is: (C4H6)n