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Q. |
Which one of the following polymers is widely used for making bullet proof material? |
A. | Polyvinyl chloride |
B. | Polyamides |
C. | Polyethylene |
D. | Polycarbonates |
Answer» D. Polycarbonates | |
Explanation: Ballistic nylon was the standard cloth used for bulletproof vests until the 1970s. In 1965, Stephanie Kwolek, a chemist at Du Pont, invented Kevlar, trademark for poly-para- phenylene terephthalamide, a liquid polymer that can be spun into aramid fiber and woven into cloth. |
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