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Chapter 9 - Chapter 9 Acrylic Fibers Acrylic and Modacrylic...

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Chapter 9 – Acrylic Fibers Acrylic and Modacrylic Fibers o Acrylic: Manufactured fibers in which the fiber forming substance is any long chain synthetic polymer composed of at least 85% by weight of acrylonitrile units PAN 100% acrylonitrile Limited industrial use (industrial fiber) Highly crystalline Thermally stable In Europe, the term PAN is used for acrylic fibers in general o Modacrylic: Less than 85% but at least 35% acrylonitril Acrylic: Dupont’s 2 nd synthetic fiber produced commercially 1950 Orlon® acrylic (commonly used in socks) 1990 phased out because solvents were found to be carcinogenic Sterling Fibers o Creslan and Cresloft o Only acrylic manufactured in US today Only 5% of world fiber production because solvent is carcinogenic (produced in Asia and India) = Acrylic manufacturing is down worldwide Manufacturing Acrylic: Acrylonitrile + 1 or more commoners o Selected to improve solubility, dyeability o Interrupt packing of polymer chains, reduce crystalinity Both dry and wet spun
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Drawn Crimped and cut into STAPLE length (as a synthetic fiber, it comes out as filament but the majority is cut into staple) Heat set in relaxed state steam Properties of Acrylic: Shape – manufactures can choose any shape Longitudinal – manufacturers can choose if it’s smooth or have striations
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