sci.polymer-crystallinity-DSC Calculator
Calculates degree of crystallinity in a polymer from DSC melting enthalpy: X_c = ΔH_m / ΔH_m° × 100%, normalised to 100% crystalline reference enthalpy. PET: ΔH_m° = 140 J/g — semicrystalline PET bottles have X_c ≈ 25%; highly oriented PET fibres reach 50–60%, giving tensile strength > 1 GPa.
Inputs
- H Melt J G
- Total heat content (kJ/mol). Negative ΔH = exothermic (heat released). Positive ΔH = endothermic (heat absorbed).
- H Crystal 100 J G
- Total heat content (kJ/mol). Negative ΔH = exothermic (heat released). Positive ΔH = endothermic (heat absorbed).
- Tm C
- Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
- Tc C
- Reference formula or conversion factor shown for context.
Results
- degree of crystallinity Xc
- The magnitude or severity on the applicable scale.
- supercooling ΔT = Tm - Tc (K)
- Sample size or count used in the calculation.
- equilibrium Tm⁰ estimate (K)
- The value at the specified point or condition.
- Xc = ΔHm / ΔHm⁰
- Reference formula or conversion factor shown for context.
- polymer context
- Sample size or count used in the calculation.
- classification
- Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.
polymer enthalpy melting supercooling crystallinity