CTD 215 Lecture 11: Textiles Chapter 11 Elastometric Fibers

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Clothing, Textiles and Interior Design
CTD 215

Elastometric Fibers Fibers with high elastic recovery Spandex • Spandexes are elastometric fibers, characterized by high elongation (400 or 500-600%) and low modulus. • Low modulus means that they have low resistance to extension. ➢ When you first begin to stretch the fibers, the molecules readily give way; there is little resistance to the stretching. As you stretch more, the molecules become aligned and the fiber begins to resist extension. Spandex also called Elastane • First produced in 1930 by DuPont. Leading US producers today are DuPont (Lycra Spandex), RadiciGroup (RadiciSpandex) and Hyosung (Creora). • Spandex is the generic name and comes form turning around the word “expand” • Lycra is a DuPont trade name, and to use the name, garment producers must adhere to some regulations. Lycra is becoming a commonly used name in a manner similar to Kleenex, Xerox, and Jell-O. Polymerization • Starting materials are polymers manufactured from chemicals derived from petroleum; the polymers are not found in nature. • Spandex polymers are 85% segmented polyurethane block copolymers. Hard blocs hold the structure while soft blocks extend easily. Spinning • Polymers are dissolved in suitable solvent systems and can be wet (Radic
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