Inter-Laminar and Intra-Laminar Kevlar Hybrid Polymer Composites: A Comprehensive Review of Mechanical, Thermal, and Tribological Behavior

Kevlar-based polymer composites have long been valued for their outstanding durability, toughness, and strength-to-weight ratios. However, limitations such as low compressive strength, high cost, and moisture sensitivity have hindered their broader application when used alone. To improve and customize performance, hybridization with synthetic reinforcements, natural fibers, and functional fillers has been used. Furthermore, load transfer and delamination resistance have been enhanced by the use of intra-laminar and inter-laminar composite structures. Factors such as fiber orientation, weave architecture, filler type, and stacking sequence significantly affect tensile, flexural, and impact performance. Thermal analyses using DSC and TGA revealed that natural fillers improve insulation, while ceramic and nanofillers enhance heat resistance and dissipation. Tribological improvements, including reduced wear and erosion, have been achieved through optimized hybridization and nanoparticle use. However, issues like achieving strong interfacial bonding, cost, recycling, and large-scale processing remain. Resolution of such gaps by systematic studies and green hybridization strategies is needed to bring Kevlar-based composites to their full potential. With an emphasis on current developments in material design and composite architecture, this research critically examines the mechanical, thermal, and tribological characteristics of Kevlar hybrid composites which enable to reveal its full potential in the field of science and industry.