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TMS 211 > Test 3 > Flashcards

Test 3 Flashcards

1
Q

nylon is most degraded by

A

ultraviolet light

acid (low ph)

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2
Q

nylon can be produced with what fiber cross-sectional shapes

A

round
tri-lobal
hollow

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3
Q

nylon fibers are made using what process

A

melt spinning

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4
Q

nylon has a low elongation compared to most other textile fibers

A

false

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5
Q

at standard lab conditions nylon absorbs how much moisture content

A

4%

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6
Q

nylon is an excellent choice for carpet because

A
  • its resilient
  • when wet, it has a very low glass transition temperature
  • it resists wear
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7
Q

nylon has high tenacity compared to what other fibers

A

rayon and acrylic

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8
Q

the melting temperature of nylon 6,6 is approximately (depending upon molecular weight)

A

250 c

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9
Q

nylon 6,6 has how many carbon atoms in the backbone of the monomer unit

A

12

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10
Q

nylon is used in what applications requiring great toughness (combining strength and elongation)

A

rope and tent

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11
Q

Fibers classified as polyester contain what chemical groups

A

C=O, An aromatic ring

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12
Q

the melting temp of polyester is approximately

A

250 C

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13
Q

polyester is most degraded by

A

hot concentrated alkali (high pH)

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14
Q

polyester has high tenacity compared to what other fibers

A

rayon and acrylic

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15
Q

polyester can be produced with what fiber cross sectional shape

A

round
tri-lobal
hollow

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16
Q

polyester fibers are made using what process

A

melt-spinning

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17
Q

at standard lab conditions polyester absorbs how much mositure content

A

.4%

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18
Q

polyester is often blended with fibers made from other polymers

A

true

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19
Q

polyester is used in what applications requiring high strength

A

rope
tent
marine anchor rope

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20
Q

polyester is an excellent choice for what end uses because of its hydrophobicity

A

geotextiles
fish nets
boat sails

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21
Q

olefin is an excellent choice for what end uses because of its resistance to uv light

A

carpet
geotextiles
upholstery

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22
Q

at standard lab conditions olefin absorbs how much moisture content

A

.1%

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23
Q

olefin fibers are made using what process

A

melt spinning and gel spinning

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24
Q

the mass density of olefin fibers contributes to what characterisitcs

A

it floats on water
high strength-weight ratio
high tenacity

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25
Olefin is most degraded by
organic solvents | UV light
26
olefin can be produced with what fiber cross sectional shapes
round tri-lobal hollow
27
fibers classified as polyethylene contain what chemical groups
C-H
28
fibers classified as polypropylene contain what chemical groups
CH3 and C-H
29
Olefin is used in what applications requiring high strength
bail twine rope bags
30
the melting temp of polypropylene is approx
165 C
31
rayon has low tenacity compared to what other fibers
olefin nylon acrylic
32
rayon fibers are made using what process
wet spinning
33
during the production of rayon, large amount of what are produced
polluting effluent
34
how do you ger cellulose during production of rayon
by removing from wood pulp or another source
35
will the molecular weight during rayon production by reduced or gained
reduced
36
how will cellulose be extruded during the rayon production
cellulose must be dissolved in a solvent
37
rayon is most degraded by
acid (low pH) microorganism hot concentrated alkali (high PH)
38
rayon absorbs nearly twice as much moisture as cotton because
it has twice as much amorphous mass
39
rayon is often blended with fibers made from other polymers
true
40
fibers classified as rayon contain what chemical groups
C-O, CH2OH
41
the melting temp of rayon is approx
with decompose before it melts
42
at standard lab conditions rayon absorbs how much moisture content
12%
43
rayon differs from cotton in what ways
rayon has lower tenacity rayon loses strength when wet rayon has less crystallinity
44
acetate absorbs much less moisture than rayon bc
hydroxyl groups have been replaced by acetyl groups
45
acetate has low tenacity compared to what other fibers
nylon acrylic olefin rayon
46
where does cellulose come durign acetate production
wood pulp or other source
47
what large amounts are produced during acetate production
polluting effluent
48
how is cellulose extruded during acetate production
dissolved in solvent
49
what happens to molecular weight in acetate production
reduced
50
how does acetate differ from tri-acetate
tri-acetate is more like polyester | tri-acetate has all of the hydroxyl groups acetylated
51
acetate is most degraded by
concentrated acid (low pH) hot concentrated alkali (high pH) organic solvents
52
acetate fibers are made using what process
dry spinning
53
at standard lab conditions acetate absorbs how much mositure
6.5%
54
acetate has low tenacity compared to what fibers
nylon polyester olefin acrylic
55
is chain growth polymericzation used in acrylic production
yes
56
what happens to acrylonitrile polymer during acrylic production
dissolved in solvent
57
acrylic is often not blended with fibers made from other polymers and used as 100% acrylic
false
58
all fibers classified as arylic contain what chemical groups
CH2, CN
59
at standard lab conditions acrylic absorbs how much mositure content
1.5%
60
the melting temp of acrylic is approx
decomposes before it melts
61
acrylic is most degraded by
hot concentrated alkali (high pH) | hot concentrated acid (low pH)
62
bc it is resistant to microorganism's and has high thermal resistance, acrylic Is used in what applications
blankets | apparel
63
acyrlic differs from wool in what ways
wool has lower tenacity acrylic is hydrophonic and generates static charges acrylic resists microorganisms and insents
64
acrylic is often blended with fibers made from other polymers
true
65
acrylic fibers are made using what processes
wet spinning | dry spinning
66
rubber has great abrasion resistance comapred to spandex
false
67
spandex is commonlu used in what products
jeans
68
elastomers at the molecular level are shaped like
springs
69
how are polyurethane fibers created
dry spinning wet spinning melt spinning
70
how do you harvest rubber
it is derived by a tree barn
71
kevlar and nomex have the same chemical structure
false
72
the following fibers have great fiber resistance
Nome
73
the following fibers have a high tensile strength
spectra, Kevlar, HDPE
74
nomex is commonlu used in tennis racquets to increase strength
false
75
kevalr and nomex have the same chemical formula
true

TMS 211 (4 decks)

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