General Properties
Short Name:
Name:
PPS
Polyphenylenesulfide
Polyphenylene sulfide is a semi-crystalline, high temperature-resistant thermoplastic. The joining of aromatic monomer units via sulfur bridges make PPS very resistant and accounts for its high mechanical strength. PPS, which is costlier than PA, is used in technical molded parts when long-term heat resistance and low water absorption is required.
Structural Formula
Properties
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 12.76 mg |
| IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase | 3 min / 5 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| 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 TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.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 / Degree of CrystallinityCrystallinity refers to the degree of structural order of a solid. In a crystal, the arrangement of atoms or molecules is consistent and repetitive. Many materials such as glass ceramics and some polymers can be prepared in such a way as to produce a mixture of crystalline and amorphous regions.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 (red) 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 TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transition temperature in the 2nd heating, with a midpoint temperature of 99°C, is 8 K lower than the Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transition exhibited in the 1st heating. The step heights (Δcp) of the Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transitions (0.11 J/(g*K) in the 1st heating and 0.13 J/(g*K) in the 2nd heating) are similar.