Two types of nanoclay and poly (ethylene-co-glycidyl methacrylates) were used to prepare the PLA/EGMA/nanoclay ternary composites. The effects of impact modifier and nanoclay particles on the microstructure development within polylactide (PLA) matrix and the resultant mechanical and electrical properties were investigated. The aim was to introduce new method to validate TEM results. The microstructure development within the PLA matrix was found to depend on the type of clay and clay loading that also controlled the mechanical properties of ternary nanocomposites. Different morphologies were obtained for PLA/EGMA/halloysite, where EGMA and halloysite were separated, and PLA/EGMA/Cloisite 93A, where Cloisite 93A was mostly embedded inside EGMA. At low clay loading (i.e. 4 wt%), PLA/EGMA/Cloisite 93A composites showed the most significant improvement in elongation at break compared to neat PLA, while PLA/EGMA/halloysite composite showed higher tensile strength and modulus compared to PLA/EGMA/Cloisite 93A. It was also found that by changing the filler loading, as a simple efficient and scalable method, morphology and mechanical performance of the nanocomposites can be manipulated. Moreover, electrical impedance spectroscopy (EIS) as a new method based on measurement of conductance and capacitance was employed for characterizing the dispersion of organoclay in polylactide ternary composites.