KevlarTM Fiber-Reinforced Polybenzoxazine Alloys for Ballistic Impact Application

Abstract

Abstract. A light weight ballistic composites from KevlarTM -reinforcing fiber having polybenzoxazine (BA)/urethane prepolymer (PU) alloys as a matrix were investigated in this work. The effect of alloy compositions on the ballistic composite properties was determined. The increase of the elastomeric PU content in the BA/PU alloy resulted in samples with tougher characteristics; the storage modulus of the Kevlar TM -reinforced BA/PU composites increased with increasing the mass fraction of polybenzoxazine. A ballistic impact test was also performed on the Kevlar TM -reinforced BA/PU composites using a 9 mm handgun and it was found that the optimal composition of BA/PU alloys should be approximately 20wt% of PU. The extent of the delaminated area and interfacial fracture were observed to change with the varied compositions of the matrix alloys. The appropriate thickness of Kevlar TM -reinforced 80/20 BA/PU composite panel was 30 plies and 50 plies to resist the penetration from the ballistic impact equivalent to levels II-A and III-A of NIJ standard. The arrangement of composite panels with the higher stiffness panel at the front side also showed the best efficiency ballistic penetration resistance.

The energy absorption enhancement in aramid fiber-reinforced poly(benzoxazine-co-urethane) composite armors under ballistic impacts

“…At the complete penetration of the projectiles, the pure poly(BA-a) composite showed a larger delaminated area due to a better fiber-matrix delamination process, while a very small delamination was observed in the epoxy composites. 19…”

“…At the complete penetration of the projectiles, the pure poly(BA-a) composite showed a larger delaminated area due to a better fiber-matrix delamination process, while a very small delamination was observed in the epoxy composites. 19 Aramid fabric with various numbers of plies is commercially utilized as an energy absorption panel in a soft body armor to confront a penetration of projectile based on NIJ Standard at test level II-A to IIIA. In this experiment, ballistic performances in terms of perforation resistance and depth of deformation on the back face of aramid fiber-reinforced poly(80BA-a-co-20PU) composite and the neat aramid fabrics at 25 plies were compared.…”

“…15–18 Poly(BA-a) composites reinforced with aramid fibers provided improved ballistic performance over the epoxy reinforced with aramid fibers with respect to a higher damage area. 19 However, poly(BA-a) having polar functional groups could form substantial interactions to aramid fibers and the ballistic performance of the composites decreased. 19,20 To alleviate this problem, polyurethane (PU) having a long nonpolar hydrocarbon chain was introduced.…”

“…19 However, poly (BA-a) having polar functional groups could form substantial interactions to aramid fibers and the ballistic performance of the composites decreased. 19,20 To alleviate this problem, polyurethane (PU) having a long nonpolar hydrocarbon chain was introduced. PU is the most important tough engineering polymers and can be tailored to offer a wide spectrum of properties.…”

Impact Analyses of a Tennis Ball onto Water-Filled Containers

“…One application of liquid filled inside structure is not only to absorb impact energy but also to add weight to the structure for minimizing its structural movement commonly found in design of vehicle barriers [20,21]. Rimdusit et al [22] studied the use of Kevlar TM fiber-reinforced polybenzoxazine alloys for ballistic impact applications.…”