PBT: Polybutylene terephthalate
- Short Name
- PBT
- Name
- Polybutylene terephthalate
- Group
- ETP - Engineering Thermoplastics
- General Properties
- Chemical Formula
- Structural Formula
-
Properties
- Glass Transition Temperature
- 40 to 60 °C
- Melting Temperature
- 220 to 230 °C
- Melting Enthalpy
- 142 J/g
- Decomposition Temperature
- 400 to 420 °C
- Young's Modulus
- 2500 to 2800 MPa
- Coefficient of Linear Thermal Expansion
- 80 to 100 *10¯6/K
- Specific Heat Capacity
- 1.3 J/(g*K)
- Thermal Conductivity
- 0.25 to 0.29 W/(m*K)
- Density
- 1.30 to 1.32 g/cm³
- Morphology
- Semi-crystalline thermoplastic
- General properties
- High stability and stiffness. Good chemical resistance to many solvents. High dimensional stability. Good friction and wear properties
- Processing
- Injection molding, extrusion
- Applications
- Electrical engineering/electronics. Vehicle manufacturing. Household goods
Internet Links
NETZSCH Measurements
- Instrument
- DSC 204 F1 Phoenix®
- Sample Mass
- 12.06 mg
- Isothermal Phase
- 3 min/3 min/5 min
- Heating/Colling Rates
- 10 K/min
- Crucible
- Al, pierced
- Atmosphere
- N2 (50 ml/min)
Evaluation
A glass transition (here at 42°C, midpoint) and a clearly structured endothermal melting effect for the α (peak temperature 226°C) and β phase (peak temperature 217°C) in the 2nd heating (green) are characteristic of PBT. In the 1st heating (blue), the glass transition midpoint temperature of 44°C was comparable to that in the 2nd heating, but is overlapped with a relaxation peak. Prior to the melting transition, a post crystallization (small exothermal peak at 207°C) occurred in the 1st heating.