Mechanical, dielectric, and dynamic mechanical properties of Al2O3–ATP/EP composites

The hybrid fillers (Al 2 O 3 –ATP hybrids) composed of two types of inorganic materials—modified alumina (Al 2 O 3 ) and modified attapulgite (ATP)—were principally prepared, following which the epoxy matrix (EP) composites reinforced with Al 2 O 3 –ATP hybrids were synthesized. The mechanical and dynamic mechanical properties of fabricated Al 2 O 3 –ATP/EP composites are enhanced by doping Al 2 O 3 –ATP hybrids into EP. The highest impact and flexural strength of EP composites (3 wt% Al 2 O 3 –3 wt% ATP/EP) are improved to 27.88 kJ/m 2 and 157.04 MPa, which are 457.6% and 89.2% higher than those of the pure epoxy resin, respectively. The glass transition temperature of Al 2 O 3 –ATP/EP composites increases by 8.8 °C, compared with pure EP composites and the dielectric constant and dielectric loss can reach 3.19 and 0.0041 at 100 Hz. These excellent mechanical and dynamic mechanical properties, accompanied by dielectric property may expand the practical applications of EP composites in industrial engineering.