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39 Cards in this Set
- Front
- Back
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is polyester often blended with other fibers ? |
YES! |
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Fibers classified as polyester contain what chemical groups? |
C=O an aromatic ring |
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Polyester cross sectional shape |
round tri-lobal hollow |
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How are polyester fibers made? |
melt-spinning |
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because of its hydrophbicity polyester is good for what uses? |
boat sails, fish nets, geotextiles |
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at standard lab conditions, polyester absorbs how much moisture content? |
.4% |
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polyester is most degraded by what? |
hot concentrated alkali (high pH) |
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melting temp of polyester is? |
250 C |
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polyester has high tenacity compared to what fibers? |
acrylic rayon |
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polyester is used in what applications because of its high strength? |
tent rope marine anchor rope |
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Olefin fibers are made using what process |
gel spinning melt spinning |
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melting temp of olefin is |
165 C |
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Olefin can have what cross-sectional shapes? |
round hollow tri-lobal |
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mass density of olefin fibers contribute to what characteristics ? |
it floats on water, high tenacity, and high strength-weight ratio |
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at standard lab temp, olefin absorbs how much moisture content? |
.1% |
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fibers classified as polypropylene contain what chemical groups? |
CH3 C-H |
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olefin has high tenacity compared to what fibers? (4) |
rayon, nylon, acrylic, polyester |
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olefin is used in what applications that require high strength? |
bags, rope bail twine |
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Olefin is good for what uses because of its resistance to UV light? |
upholstery geotextiles carpet |
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rayon has low tenacity compared to what fibers? |
acrylic olefin nylon |
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because it is hydrophilic rayon is used for what? |
bandages women's wear |
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rayon melting temp? |
it decomposes before melting |
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rayon is most degraded by |
microorganisms acid (low pH) hot concentrated alkali |
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Rayon moisture regain? |
12% |
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rayon fibers are made using what process? |
wet spinning |
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is rayon blended with other fibers? |
YES |
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rayon chemical groups |
C-O CH2OH |
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acetate moisture content |
6.5% |
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acetate absorbs less moisture that rayon because |
hydroxyl groups have been replaced by acetyl groups |
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because of drape and softness, acetate is used for? |
drapes suit linings casket linings |
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how are acetate fibers made? |
dry spinning |
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acetate has low tenacity compared to? |
all of the above |
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how are acrylic fibers made? |
wet and dry spinning |
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acrylic chemical groups |
CN CH2 |
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does acrylic blend? |
yes! |
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acrylic melting temp |
it has none |
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acrylic is most degraded by |
hot alkali hot acid |
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is acrylic often blended? |
yes! |
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because it is resistant to microorganisms and is high heat resistant, acrylic is used for |
apparel blankets |
