Technological growth in advanced
ammunition and weapons has led
to development of protective antiballistic composites, which are mostly
based on aramid fibers, as they absorb high impact energy, arising
from penetrators. Enhanced performance of aramid fibers (modulus ∼
112,400 MPa) is attributed to their compact molecular structure, hydrogen-bonding,
high crystallinity, and high density (∼1.44 g/cm3). Methodologies such as layer-by-layer, shear thickening, yarn pull-out,
and surface functionalization via nanomaterials have been reported
for modification of aramid fibers, which are widely used with thermosets
like epoxy (due to process-friendliness). Recently, researchers are
exploring thermoplastics with aramids, due to their higher toughness,
chemical resistance, and thermal stability. Modification of aramid
fibers is mostly performed using nanomaterials, e.g., carbon nanotubes,
graphene, silk fibroins, SiO2, and ZnO, for enhancing their
performance and minimizing fiber buckling under load. This Review
presents advances in modification of aramid fibers using nanomaterials
with emphasis on thermoplastics for protective applications, their
stress transfer mechanisms, and life cycle analysis and concludes
with their recycling/recovery methods.