SB: Styrene/Polybutadiene copolymer
- Short Name
- SB
- Name
- Styrene/Polybutadiene copolymer
- Group
- CTP - Commodity Thermoplastics
- General Properties
- Chemical Formula
- Structural Formula
-
Properties
- Glass Transition Temperature
- -90 to -50 / 80 to 110 °C
- Melting Temperature
- - °C
- Melting Enthalpy
- - J/g
- Decomposition Temperature
- 440 to 455 °C
- Young's Modulus
- 1800 to 2500 MPa
- Coefficient of Linear Thermal Expansion
- 70 *10¯6/K
- Specific Heat Capacity
- 1.2 to 1.3 J/(g*K)
- Thermal Conductivity
- 0.17 to 0.18 W/(m*K)
- Density
- 1.05 g/cm³
- Morphology
- Amorphous thermoplastic
- General properties
- High transparency, high toughness and stiffness.
- Processing
- Injection molding, extrusion, deep drawing
- Applications
- Packaging, toys.
Internet Links
NETZSCH Measurements
- Instrument
- DSC 204 F1 Phoenix®
- Sample Mass
- 12.17 mg
- Isothermal Phase
- 5 min
- Heating/Colling Rates
- 10 K/min
- Crucible
- Al, pierced
- Atmosphere
- N2 (40 ml/min)
Evaluation
Both for block and graft copolymers, the characteristic properties of the monomers are largely retained so that SB has two glass transitions. The glass transition in the low-temperature range (here in both heatings at -84°C, midpoint) is due to the
butadiene component. The glass transition at 98°C (2nd heating, green, midpoint) is due to the styrene component.
The irreversible effect in the 1st heating (peak temperature 76°C) indicates the release of strong tensions in the material that are either caused by the thermomechanical history of the polymer or by the sample preparation.
butadiene component. The glass transition at 98°C (2nd heating, green, midpoint) is due to the styrene component.
The irreversible effect in the 1st heating (peak temperature 76°C) indicates the release of strong tensions in the material that are either caused by the thermomechanical history of the polymer or by the sample preparation.