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sci.glass-transition-DSC Calculator
Determines polymer glass transition temperature Tg from DSC heat flow data as the midpoint of the step change in heat capacity. Tg separates glassy (brittle) from rubbery (ductile) behaviour — polycarbonate Tg ≈ 147 °C; PVC ≈ 82 °C; natural rubber ≈ −70 °C.
Inputs
Onset Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Midpoint Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Endpoint Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Heat Flow Baseline
Reference formula or conversion factor shown for context.
Results
Tg midpoint (°C)
Sample size or count used in the calculation.
Tg onset (°C)
Sample size or count used in the calculation.
transition breadth ΔT (°C)
Sample size or count used in the calculation.
ΔCp (heat capacity step)
The value at the specified point or condition.
ASTM E1356 method
The recommended calculation method or analytical approach for these conditions.
PET Tg
Reference formula or conversion factor shown for context.