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sci.polymer-glass-transition Calculator
Calculates the glass transition temperature of a polymer from free volume theory: Tg = T₀ + C₁/(C₂ + f_g/αf), where αf is the free volume expansion coefficient. WLF equation constants C₁ = 17.4 and C₂ = 51.6 K are approximately universal for polymers well above Tg.
Inputs
Tg Inf K
Reference formula or conversion factor shown for context.
K Fox Constant K G Mol
Reference formula or conversion factor shown for context.
Mn G Mol
Count of items or occurrences.
Results
Tg (K)
Reference formula or conversion factor shown for context.
Tg (°C)
Reference formula or conversion factor shown for context.
Tg_∞ (high MW limit) (°C)
Reference formula or conversion factor shown for context.
Tg = Tg_∞ - K/Mn
Sample size or count used in the calculation.
below Tg: glassy | above Tg: rubbery/viscous
Reference formula or conversion factor shown for context.