Epitaxial crystallization of highly oriented films of LLDPE/IPP blends has been studied in this work by means of trsamission electron microscopy. The melt-drawn films of pure LLDPE or IPP consist of highly oriented lamellar structure. The growth direction of LLDPE and IPP lamellae is perpendicular to the drawing direction. When the content of LLDPE in the LLDPE/IPP blends is below 40%

epitaxial growth of LLDPE lamellae on highly oriented IPP lamellae has been observed. The intercrossing angle of the two kinds of epitaxial lamellae is about ±45℃

while the contact planes should be (010) of IPP and (100) of LLDPE.There is noabove relationship of epitaxial crystallization in the films when the content of LLDPE in the blends is over 50% because of the formation of independent domain of LLDPE.When the films of LLDPE/IPP blends was heat-treated at 135℃(above the melting point of LLDPE) for 15 min

and subsequetly cooled to room temperature

the epitaxial relationship between LLDPE and IPP is maintained.