HUEC 2040-CH. 5 OUTLINE

HUEC 2040-CH 5 - Chapter 5 PROTEIN FIBERS Protein fibers fibers in which basic chemical structure is composed of amino acids joined in polypeptide

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Unformatted text preview: Chapter 5 PROTEIN FIBERS Protein fibers- fibers in which basic chemical structure is composed of amino acids joined in polypeptide chains Two Basic groups 1) Animal Hair Fibers- major fiber group is sheep’s wool; other fibers come from animals such as: alpaca, camel, cashmere goat, llama, vicuna, guanaco, and angora goat (fleece provides mohair); also used are: qiviut (hair from musk ox); angora rabbit hair; fur fiber from animals such as: beaver, mink, and rabbit; cow & horsehair 2) Fibers formed from extruded filaments- silk, produced by silkworm caterpillar, is only important fiber in this group Fibers of the Protein Family- Animal hair fibers o Wool from sheep) o Specialty hair fibers Camel family • Camel • Alpaca • Llama • Vicuna • Huarizo • Guanaco • Misti Goat family • Cashmere • Mohair (from angora goat) • Qiviut (from musk ox) o Fur fibers Beaver Fox Mink Chinchilla Rabbit (especially angora rabbit) o Other Horsehair Cow hair- Extruded fibers o Natural Silk (from silkworm) Spidersilk o Manufactured Soysilk The Protein Family- All protein fibers contain ele m e nts: carbon, hydrogen, oxygen, a nd nitrogen o Wool contains sulfur as well o In e ach fiber thes e ele m ents co mbined in different arrang e m e nts causing properties of v fibers to h ave drastic differences- Com mon physical properties o Tend to be weaker than cellulosic, weaker wet than dry o Must b e handled with care during laundering or wet processing o Have greater resilience a nd elongation o More resistant to wrinkling and hold shap e b etter o Specific gravity tends to b e lower; feel lighter in weight in comp arison to comp arable fab cellulosic fibers o Do not burn as readily as cellulosic: when s et aflam e, m ay extinguish the ms elves, s m ell h air, flesh, or feath ers o Da m ag ed by dry h e at; iron with press cloth or ste a m- Com mon che mical properties o Susceptibility to d a m a g es by bas es & oxidizing a g ents, e sp ecially chlorine bleach o Clean with solutions that are “pH b alanced”—neutral or slightly acidic o Strongly alkaline soaps & d et ergents da m a g e, acids have less effect than on cellulosic o Bleached safely with hydrogen peroxide but chlorine bleaches harmful- Common environ. Properties o Sunglight discolors white fabrics—turning them yellow o Wool has better resistance to sunlight to cotton but will degrade with prolonged exposur o Silk degrades readily on exposure Animal Hair Fibers- Fleece of sheep most widely used- In central Asia, camel is important source of textile fiber- South America home of number of camel-like animals that produce fibers used for spinning/- Alpaca and Llama native to Andes Mountain regions & have also been domesticated- Vicuna & guanaco wild or semi-wild animals from same region- Other animal hair comes from domesticated goats: angora goat & cashmere goat- Rabbit, musk ox, horses, cows (wild or domesticated) have minimal use in textile...
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This note was uploaded on 05/06/2010 for the course HUEC 2040 taught by Professor Staff during the Fall '08 term at LSU.

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HUEC 2040-CH 5 - Chapter 5 PROTEIN FIBERS Protein fibers fibers in which basic chemical structure is composed of amino acids joined in polypeptide

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