Zinc oxide (ZnO) nanoparticles are known as cost-effective fillers in polymer composites, but their curing properties disruption is a challenge. This was addressed by modifying ZnO nanoparticles with (3-Aminopropyl) triethoxysilane (APTES) to improve their dispersion and overall performance in an acrylic resin matrix. FE-SEM and EDX-mapping outcomes evidenced that the ZnO nanoparticles dispersion was improved significantly after modification via APTES amino-silanes. EIS achievements showed that the composites total resistance rose from 1010 to 1011 Ω cm2 after using modified ZnO nanoparticles. According to the rheological analysis, interconnected microstructures were formed at 0.5 wt.% of pure and modified ZnO nanoparticles.