PPS: Polyphenylenesulfide

Short Name
HTRTP - High-Temperature Resistant Thermoplastics
General Properties
Chemical Formula
Structural Formula


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)
1.34 to 1.36 g/cm³
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
Injection molding, blow molding, extrusion
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

DSC 204 F1 Phoenix®
Sample Mass
12.76 mg
Isothermal Phase
3 min/5 min
Heating/Colling Rates
10 K/min
Al, pierced
N2 (40 ml/min)


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.

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