how do the acrylic fiber be identified
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Ester comonomers disrupt the structure of polyacrylonitrile and, therefore, allow easier penetration of basic dyes. Mixed stains containing an acid dye, a disperse dye, and a basic dye form the basis of both published identification schemes for acrylic fibers.
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For a fiber to be called "acrylic" in the US, the polymer must contain at least 85% acrylonitrile monomer. Typical comonomers are vinyl acetate or methyl acrylate. DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon.
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