Equilibrium melting temperature θ°
m of nylon 66 (polyiminoadipoyliminohexamethylene) fractions having the viscosity-average molecular weight
Mv from 2.08×10
4 to 4.19×10
4 is determined according to the so-called annealing method proposed by Kamide (Kobunshi Kagaku 25, 532 (1968)). The apparent melting temperature θ
m and the heat of fusion Δ
Hf are evaluated by differential scanning calorimetry for samples annealed at temperatures just below θ
m of the untreated sample for various length of time
ta. θ°
m is determined by use of the relation: θ°
m=lim
ta→∞Δ
Hf→0 θ
m (
ta, Δ
Hf) and is found to be 275.8°C for
Mv=2.08×10
4, 275.5°C for
Mv=3.68×10
4 and 275.7°C for
Mv=4.19×10
4, respectively.
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