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Chapter 11-1 - Chapter 11 Elastomeric Fibers A natural or...

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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
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