TPO, TPV: Polyolefine based TPE
- Short Name
- TPO, TPV
- Name
- Polyolefine based TPE
- Group
- TPEM - Thermoplastic Elastomers
- General Properties
- Chemical Formula
- Structural Formula
-
Properties
- Glass Transition Temperature
- -60 to -50 °C
- Melting Temperature
- -20 to 40 (EPDM), 150 to 160 (PP) °C
- Melting Enthalpy
- 10 (EPDM), 20 (PP) J/g
- Decomposition Temperature
- 350/460 to 480 °C
- Young's Modulus
- 90 to 1400 MPa
- Coefficient of Linear Thermal Expansion
- 15 to 130 *10¯6/K
- Specific Heat Capacity
- - J/(g*K)
- Thermal Conductivity
- - W/(m*K)
- Density
- 0.87 to 1.20 g/cm³
- Morphology
- Blend of semi-crystalline polyolefin and amorphous rubber
- General properties
- Depending on the mixing ratio and the polyolefin employed
- Processing
- Injection molding, extrusion, blow molding
- Applications
- Automobile industry (bumper covers, cover panels). Shoes
Internet Links
NETZSCH Measurements
- Instrument
- DSC 204 F1 Phoenix®
- Sample Mass
- 12.08 mg
- Isothermal Phase
- 8 min/3 min/8 min
- Heating/Colling Rates
- 10 K/min
- Crucible
- Al, pierced
- Atmosphere
- N2 (40 ml/min)
Evaluation
Due to their composition, TPVs exhibit both a glass transition, from their elastomer component, and a melting transition, from their thermoplastic component.
In this example, the 2nd heating (green) shows a glass transition at -59°C (midpoint) that is immediately followed by an endothermal effect with a peak temperature of -15°C and an enthalpy of less than 10 J/g. Both can be related to the soft and hard segments of a rubber, probably EPDM. A larger endothermal effect with a peak temperature of 154 °C (heat of fusion 16 J/g) is due to the melting of the olefin component and is characteristic of polypropylene.
The DSC curves from the two heatings are nearly identical.
In this example, the 2nd heating (green) shows a glass transition at -59°C (midpoint) that is immediately followed by an endothermal effect with a peak temperature of -15°C and an enthalpy of less than 10 J/g. Both can be related to the soft and hard segments of a rubber, probably EPDM. A larger endothermal effect with a peak temperature of 154 °C (heat of fusion 16 J/g) is due to the melting of the olefin component and is characteristic of polypropylene.
The DSC curves from the two heatings are nearly identical.