In the present work, low density polyethylene (LDPE)/aliphatic polyester (APES)/organoclay ternarynanocomposites were prepared. In particular, the effect of a compatibilizer, polyethylene-graft-maleic anhydride(PE-g-MAH), on the morphology and properties of the ternary nanocomposites was investigated. LDPE/APES/organoclay nanocomposites were prepared through melt intercalation method using two different kinds of organoclay.The dispersibility of silicate clays in the nanocomposites was investigated by X-ray diffraction and atomic forcemicroscopy. The ternary nanocomposites showed higher tensile properties than the LDPE/APES blend did. Thedispersibility and properties of nanocomposites containing Cloisite 30B were better than those of the nanocompositescontaining Cloisite 20A. Unlike Cloisite 20A, hydroxyl groups in the intercalants in Cloisite 30B interlayer underwenta certain polar interaction with the carboxyl group of APES, favoring the intercalation of APES chains and theformation of LDPE/APES/Closite30B nanocomposites. However, the introduction of the polar hydroxyl groups alsoenhanced the interaction with the silicate surface at the same time, thereby rendering somewhat difficult thereplacement of the surface contacts by LDPE chains, and impeding the extensive intercalation and further exfoliationof Cloisite 30B in the LDPE/APES matrix. The compatibilizer enhanced the intercalation of the polymer chaininside the clay gallery and thus improved the mechanical properties of the ternary nanocomposites. Rheologicalmeasurements of the nanocomposites via frequency sweep experiment indicated a certain interaction between theclay platelet and the polymer molecules in the melted state.