PPS: Polyphenylenesulfide
- Short Name
- PPS
- Name
- Polyphenylenesulfide
- Group
- HTRTP - High-Temperature Resistant Thermoplastics
- General Properties
- Chemical Formula
- Structural Formula
-
Properties
- Glass Transition Temperature
- 85 to 100 °C
- Melting Temperature
- 275 to 290 °C
- Melting Enthalpy
- 80 J/g
- Decomposition Temperature
- 515 to 550 °C
- Young's Modulus
- 3700 MPa
- Coefficient of Linear Thermal Expansion
- 50 to 70 *10¯6/K
- Specific Heat Capacity
- - J/(g*K)
- Thermal Conductivity
- - W/(m*K)
- Density
- 1.34 to 1.36 g/cm³
- Morphology
- Semi-crystalline polymer
- General properties
- Very good chemical resistance. High stability, stiffness and hardness. Very good solvent resistance. Very good electrical insulation properties. High Gamma and X-ray resistance. Minimal absorption of humidity
- Processing
- Injection molding, blow molding, extrusion
- Applications
- Electrical/electronics (e.g., encapsulation of chips, coil bodies). Structural components for chemical surroundings (valves, pump casings, fittings, etc.). Automotive industry. Food industry
Internet Links
NETZSCH Measurements
- Instrument
- DSC 204 F1 Phoenix®
- Sample Mass
- 12.76 mg
- Isothermal Phase
- 3 min/5 min
- Heating/Colling Rates
- 10 K/min
- Crucible
- Al, pierced
- Atmosphere
- N2 (40 ml/min)
Evaluation
In addition to the endothermal melting transition (peak temperature 282 °C, melting enthalpy 38 J/g), the 1st heating (blue) showed a glass transition at 107°C (midpoint), followed by an endothermal effect with a peak temperature of 159°C.
TGA investigations (not shown here) confirmed that this endothermal effect at 159°C was not related to evaporation of humidity or residual monomers. Moreover, the increase in crystallinity could be a tempering peak due to storage of the polymer at a temperature above 159°C. This assumption is also supported by the larger melting enthalpy in the 2nd heating (green) of approx. 45 J/g. Due to the shoulder (233°C) of the melting effect in the 2nd heating, it seems that this melting phase originates from the endothermal effect at 159°C (1st heating).
The glass transition temperature in the 2nd heating, with a midpoint temperature of 99°C, is 8 K lower than the glass transition exhibited in the 1st heating. The step heights (Δcp) of the glass transitions (0.11 J/(g.K) in the 1st heating and 0.13 J/(g.K) in the 2nd heating) are similar.
TGA investigations (not shown here) confirmed that this endothermal effect at 159°C was not related to evaporation of humidity or residual monomers. Moreover, the increase in crystallinity could be a tempering peak due to storage of the polymer at a temperature above 159°C. This assumption is also supported by the larger melting enthalpy in the 2nd heating (green) of approx. 45 J/g. Due to the shoulder (233°C) of the melting effect in the 2nd heating, it seems that this melting phase originates from the endothermal effect at 159°C (1st heating).
The glass transition temperature in the 2nd heating, with a midpoint temperature of 99°C, is 8 K lower than the glass transition exhibited in the 1st heating. The step heights (Δcp) of the glass transitions (0.11 J/(g.K) in the 1st heating and 0.13 J/(g.K) in the 2nd heating) are similar.