Polycarbonate Polycarbonate (PC) is a popular polymer material used, among other things, for electric tool casings. To optimize the production/molding process by finite element simulations, the thermophysical properties have to be known. The thermal diffusivity can be determined not only in the solid region but also at temperatures above the glass transition (>140°C) if a molten material cell is employed in the LFA 457. Together with the specific heat (measured with a DSC) and density data, the thermal conductivity can be determined. The slight increase in the thermal conductivity versus temperature is typical for 100% amorphous materials. Furthermore, the glass transition is visible in the specific heat curve and in the thermal diffusivity result. In the thermal conductivity result, this second order transition cannot be seen.

Technical Specifications

Standard Sample SizeØ 10 mm, 0.1 to 6 mm thickØ 12.7 mm, 0.1 to 6 mm thickØ 25.4 mm, 0.1 to 6 mm thick10 mm x 10 mm, 0.1 to 6 mm thickFurnaces-125 to 500°C (Helium atmosphere recommended)RT to 1100°CLaserNd-glass, Energy:0 to 15 J, Pulse Width: 0.33 ms SensorsMCT (Mercury Cadmium Telluride), LN2-cooledInSb (Indium Antimonide), LN2-cooled Thermal Diffusivity Range0.01 mm
2 /s to 1000 mm
2 /sThermal Conductivity Range0.1 W/(m·K) to 2000 W/(m·K) RepeatabilityThermal Diffusivity: ±3% (for most materials)Specific Heat: ±5% (for most materials)AccuracyThermal Diffusivity:±5% (for most materials)Specific Heat:±5% (for most materials)Measurement atmosphereInert, oxidizing or vacuum (<10
-2 mbar)Utilities110/230 V 50/60 Hz, 16 A (one 230 V line is required for the PU) Water 1 liter/week, LN2 2 liters/dayDimensions (Measurement part)width: 570 mm, depth: 550 mm, height: 880 mm

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