HECOL170 Lecture Notes - Lecture 11: Angora Goat, Cashmere Goat, Petroleum Ether
13 Jul 2018
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Document Summary
More types of amino acids in wool than silk. Amino acids in wool have larger molecular side groups - bulkier and less compact. Cashmere (goat), angora (rabbit), yak: medium bres: Cashgora (hybrid angora and cashmere goat), bactrian camel: coarse bres: Properties to all protein fibres: resiliency - resists wrinkling, wrinkles disappear between uses, fabrics maintain shape, hygroscopic - comfortable, protects from humidity in cool, damp climate, weaker when wet - handle carefully when wet. Silk loses about 15% of strength: speci c gravity - fabrics feel lighter than cellulosics of the same thickness, harmed by alkali - use neutral or only slightly alkaline soap for detergent. Perspiration weakens the bres: harmed by oxidizing agents - chlorine bleach damages bres, should not be used. Sunlight causes fabrics to yellow: harmed by dry heat - wool becomes harsh and brittle, scorches easily. use steam. White silk and wool will turn yellow: ame resistance - do not burn readily and self extinguishing.
