TPS: Thermoplastic Styrene Elastomer

General Properties

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TPS

Thermoplastic Styrene Elastomer


TPS is a tri-block copolymer with two styrene blocks (hard segments) on each end and an elastomeric block (soft segments, polydiene or hydrogenated polydiene) in the center. Characteristic properties of both hard and soft segments are also observed in the DSC curves.

Structural Formula


Properties

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-80 to -50 (butadiene), 85 to 100 (styrene) °C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Temperature150 to 160 (PP) °C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Enthalpy20 J/g
Decomposition Temperature440 to 455°C
Young's Modulus10 to 200 MPa
Coefficient of Linear Thermal Expansion (CLTE/CTE)The coefficient of linear thermal expansion (CLTE) describes the length change of a material as a function of the temperature.Coefficient of Linear Thermal Expansion-
Specific Heat Capacity-
Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.Thermal Conductivity-
DensityThe mass density is defined as the ratio between mass and volume. Density0.88 to 1.30 g/cm³
MorphologyThermoplastic elastomer, copolymer with hard and soft segments
General propertiesGood hydrolysis resistance. High thermal resistance. Good aging resistance
ProcessingInjection molding, extrusion, blow molding
ApplicationsShoe industry (soles). Medical products. Screwdrivers, handles, electric tools (multi-component injection molding with hard and soft segments, whereas TPS represents the soft component)

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass15.25 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase8 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)

Evaluation

The present material is a blend from the tri-block copolymer and PP. In the 2nd heating (red), 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 can be seen at -68°C (midpoint), followed by a broad, endothermal effect (peak temperature -14°C), both of which are related to the butadiene component. A small 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 for the polystyrene component can be seen at approx. 85°C (midpoint). This is followed by two endothermal effects with a total melting enthalpy of approx. 15 J/g; a smaller one at 115°C and a larger one at 154°C (peak temperature). The main peak is attributable to the melting of PP. The smaller peak at 115°C may be due to the presence of some PE. The DSC curves from the 1st and 2nd heatings are nearly identical.