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Orlon is a brand name for the synthetic fiber made from polyacrylonitrile (PAN). Polyacrylonitrile is a vinyl polymer formed by the addition polymerization of acrylonitrile (CH₂=CH-CN) monomers. The repeating unit is -(CH₂-CH(CN))-.
Orlon/Acrylic fibers are widely used in textiles as a wool substitute because they are lightweight, warm, and soft. They are distinct from polyesters (like Dacron/Terylene), polyamides (like Nylon), or natural polymers like cellulose.
Therefore, Orlon fibers are made up of polyacrylonitrile, which is Option 1.
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