AbstractThe isothermal crystallization kinetics of the anionic copolyamides of ω‐octanelactam (OL) with ω‐laurolactam (LL) (nylon‐8/nylon‐12), covering a wide composition range (0/100 – 100/0 OL/LL, mol/mol), was established according to the Avrami equation by the use of differential scanning calorimetry. The crystallization parameters half‐time crystallization (t1/2), Avrami index (n), rate constant (k), and reduced crystallinity were determined for various crystallization temperatures. These parameter values are correlated to the composition of the copolyamides, the crystallization and supercooling temperature, and the results are discussed.Differences in kinetic parameter values between the homopolymers of this paper and those for the hydrolytic nylon‐8 and nylon‐12 reported in literature were obser