FASH 290 Lecture Notes - Lecture 8: Acrylonitrile, Corn Starch, Polyimide
Document Summary
Elastomers - ca(cid:374) stretch at least (cid:1006) x"s (cid:894)(cid:1006)(cid:1004)(cid:1004)%(cid:895) a(cid:374)d retur(cid:374) immediately and forcibly to original length. Comfort stretch vs. power stretch (high retractive forces: rubber both natural source and synthetic (ex. neoprene) extruded in sheets and cut (not spun) Cannot be dry cleaned, excellent elasticity, low tenacity, poor resistance to aging, sunlight, oil, perspiration and oxidizing agents. Poor hand, low regain, low dye ability (cover yarns needed and add to $: spandex 1958 , wet spun. Grin-through - can be dry cleaned: others - elastoester, elasterell-p, lastol. Aramid 1974, an aromatic polyamide -wet or dry spun - drawn - tends to be solution dyed oleophilic and static prone. Introduced as a type of nylon but significantly different in production and properties. Examples: nomex (heat), kevlar (impact strength and stiffness) 5 times stronger by weight than steel. Glass melt spun (as early as with the romans) - co(cid:373)(cid:373)ercial productio(cid:374) (cid:1005)9(cid:1006)(cid:1004)"s - no apparel uses.
