Which polymer is used for making bulletproof vests?

Kevlar

The correct answer is option 1. Kevlar.

Kevlar is a synthetic fiber that was developed by Stephanie Kwolek at DuPont in 1965. It is made from long chains of poly-paraphenylene terephthalamide, which are oriented parallel to each other and tightly bound together by intermolecular forces. This molecular structure gives Kevlar its exceptional strength and toughness.

One of the key properties of Kevlar is its high tensile strength, which is several times stronger than steel on a weight-to-weight basis. This strength allows Kevlar fibers to absorb and dissipate the energy of a bullet impact, reducing the force transmitted to the wearer. As a result, Kevlar is widely used in the production of ballistic-resistant body armor, commonly known as bulletproof vests.

Bulletproof vests made with Kevlar are designed to stop bullets by spreading and absorbing the impact energy over a larger area, rather than allowing the bullet to penetrate the vest and cause injury. Kevlar's lightweight and flexible nature also make it comfortable for wearers to move freely while providing protection.

In addition to its use in body armor, Kevlar is also used in a variety of other applications where strength, durability, and heat resistance are important, including aerospace, automotive, marine, and sports equipment.

Overall, Kevlar's combination of strength, toughness, and versatility has made it an invaluable material for protecting individuals in high-risk environments and enhancing the safety and performance of various products and industries.