Nucleation and crystallization kinetics of polyamide 12 investigated by fast scanning calorimetry

Nucleation and crystallization of polyamide 12 (PA 12) have been systematically investigated by fast scanning calorimetry at non-isothermal isothermal conditions. The critical cooling rates crystal nucleation were determined as 300 10,000 K/s, respectively. Moreover, the half-times (t1/2,nucl) overall (t1/2,cry) show monomodal bimodal dependencies on temperature. t1/2,nucl has an approximate minimum value about 0.0005 s 333 K, which is 10–20 K above glass transition temperature, t1/2,cry two minima 0.05 0.8 383 Comparing behavior PA with other polyamides, activation energy for increases barrier short-range diffusion decreases increase amide-group density in chains.