This study presents isothermal crystallization kinetics of Polyamide 6/Liquid Natural Rubber (PA6/LNR) blends of different compositions, at different crystallization temperatures using the DSC technique at high under cooling (Delta T>80 degrees C). The results showed that the degree of crystallinity of PA6/LNR blend is less than that of PA6. Neat PA6 exhibits a single melting peak while blends exhibit an additional diffused peak at lower temperatures. The PA6/LNR blends showed relatively lower half crystallization time than PA6. The isothermal crystallization kinetics of PA6 and blends has been described by the Avrami equation and Sestak Berggren equation. The Avrami exponent, n for PA6 is in the range of 2-3 and that of blends is in the range of 1-2, at high under cooling conditions. In general, with the addition of LNR, the shape of the nuclei tends to change from spherical to plate/disk geometry. The equilibrium melting temperatures of the blends was evaluated based on Hoffman-Weeks theory. (C) 2014 Elsevier B.V. All rights reserved.