The non-isothermal crystallization kinetics of reactive microgel/nylon 6 blends was investigated by differential scanning calorimetry (DSC). The Mo equation was employed to analyze the non-isothermal crystallization data. The crystallization activation energies were also evaluated by the Kissinger method. The results show that the crystallization onset temperature (T-onset) and crystallization peak temperature (T-p) decrease with the increase of the content of reactive microgel, while Delta T (T-onset-T-p), the crystallization half-time (t(1/2)) and the crystallization enthalpy (Delta H-c) increase. The required cooling rates of blends are higher than that of neat nylon 6 in order to achieve the same relative crystallinity in a unit of time. The crystallization activation energies of the reactive microgel/nylon 6 blends are greater than those of the neat nylon 6. When the content of reactive microgel is 30%, the relative crystallinity (X-t) reaches the maximum. (C) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.