Which one of the following polymeric materials is used for making bullet proof jacket?

Kevlar is a heat-resistant para-aramid synthetic fiber widely recognized for its use in ballistic body armor and bulletproof jackets [t6]. Developed by Stephanie Kwolek at DuPont in the 1960s, it is characterized by a molecular structure with many inter-chain bonds and high crystallinity, providing exceptional tensile strength and impact resistance [t1][t6]. Para-aramid fibers like Kevlar have largely replaced older materials like Nylon in military armor because they offer superior thermal resistance, high modulus, and tenacity while remaining lightweight and flexible [t1][t2]. While other polymers like Nylon 6,6 and Dacron (polyester) are used in general textiles, they lack the specific ballistic protective characteristics of para-aramids [c1][t2]. Kevlar's unique ability to absorb and dissipate energy from high-velocity projectiles makes it the industry standard for soft body armor [t3][t7].

Sources

1. [1] https://www.sciencedirect.com/topics/engineering/para-aramid-fibre
2. [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 28: Manufacturing Industry and The Iron and Steel Industry > Groups of Industries > p. 279