Chapter 11-1 - Chapter 11 Elastomeric Fibers A natural or synthetic polymer which at room temperature can be stretched repeatedly to at least twice its

Chapter 11 Elastomeric Fibers: • A natural or synthetic polymer which at room temperature can be stretched repeatedly to at least twice its original length and which after removal of the tensile load will immediately and forcibly return to approximately its original length. • *rubber – natural, original elastomeric fiber • *spandex – first commercially successful synthetic eleatomeric fiber • Lycra *Dupont’s trademark name for spandex • anidex - no longer produced • elastoester – made in Japan • elasterell-P • T400® - Invista *#41* • Polyester subclass • lastol • Dow XLA™ *#40* • Olefin subclass Spandex: • 1959 in U.S. - Lycra® spandex • A manufactured fiber in which the fiber-forming substance is a long-chain synthetic polymer comprised of at least 85% of a segmented polyurethane • elastane is the term of spandex globally instead of spandex Chemical composition of spandex: • block copolymer • segmented polyurethane • rigid aromatic segments • H bonded crystalline areas • polyester segments • amorphous areas

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• stretch • crosslinks between chains Manufacturing Spandex: DuPont • Lycra® spandex – dryspun – tacky fibers fuse in bundles (add tenacity) RadiciSpandex • Glospan® spandex – reaction spinning • short chain→long chain – fibers adhere to form bundles (adds tenacity) Asahi Kasei Gr o up • Roica®spandex