Melting behavior and non‐isothermal crystallization kinetics of copolyamide 6/12

Polymer crystallization obeys the laws of thermodynamics. Studying dynamic crystallization from melt to solid state may extend the general understanding of the crystallization behavior of polymers. In this work, non-isothermal crystallization kinetics of copolyamide 6/12 (CoPA6/12) with different copolymerization ratios were investigated by differential scanning calorimetry. Jeziorny modified Avrami equation, Ozawa equation and Liu-Mo's method were applied to analyze the non-isothermal crystallization kinetics of CoPA6/12. The crystallization activation energy was evaluated using both Kissinger and Friedman methods. Results show that the incorporation of ω-laurolactam into polyamide 6 (PA6) decreases crystallization rate and increases crystallization activation energy. The findings further indicate that the crystallization of polyamide is inhibited because copolymerization hinders the formation of PA6 crystal nuclei.