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Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Polymers
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Polymer used in bullet proof glass is

$\begin {array} {1 1} (a)\;PMMA & \quad (b)\;Lexan \\ (c)\;Nomex & \quad (d)\;Kevlar \end {array}$


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Explanation: Bullet-resistant glass is usually constructed using polycarbonate, thermoplastic, and layers of laminated glass. The aim is to make a material with the appearance and clarity of standard glass but with effective protection from small arms. Polycarbonate designs usually consist of products such as Armormax, Makroclear, Cyrolon, Lexan or Tuffak, which are often sandwiched between layers of regular glassAcrylic fibers are synthetic fibers made from a polymer (polyacrylonitrile) with an average molecular weight of ~100,000, about 1900 monomer units. To be called acrylic in the U.S, the polymer must contain at least 85% acrylonitrile monomer. Typical comonomers arevinyl acetate or methyl acrylate. DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon. Acrylic is also called acrilan fabric.
Ans : (b)
answered Mar 6, 2014 by thanvigandhi_1
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