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Final Exam 3500
N/A
150
Other
Undergraduate 3
05/05/2013

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Term
What is the functional group of:
CH3-CH2-OH
Definition
Term
What is the functional group of:
HO-CH2-CH2-OH
Definition
Term
What is the functional group of:
H2N-CH2-CH2-NH2
Definition
Term
What is the functional group of:
CH3OOC=COOCH3
Definition
Term
What is the functional group of:
COOH=COOH
Definition
Term
What is ester?
Definition
CH3-O-C=O----------O=C-O-CH3
Term
What is the monomer of polypropylene shown below? [-CH-CH2]-CH3 (5,000)
Definition
CH=CH2-CH3
Term
All man made fibers can be stretched to reduce fiber tenacity when they are formed during a spinning process. True or False?
Definition
False
Term
Which of the following has the highest degree of polymerization?

(-CH2-CH2-)-2300
(-CH2-CH-CH-CH2-CH3)-2300
(-CH-CH2-)-2300
Definition
A,B, and C have the same degree of polymerization.
Term
Which has the highest molecular weight?

a. (-CH2-CH2-)-2300
b. (-CH2-CH-CH-CH2-CH3)-2300
c. (-CH-CH2-)-2300
Definition
B
Term
In the following strength-elongation plot, the breaking elongation of "Fiber A" is approximately ____ of that of "Fiber B."
Definition
60%
Term
A fiber was tested to determine the percentage moisture regain. A fiber sample weighs 9.50g. After it reaches equilibrium with its environment in a conditioning room, it weighs 9.90g. When the fiber sample is completely dried, it weighs 9.00g. What is the percentage moisture regain (%)?
Definition
More than 9.90%
Term
A fiber with high molecular orientation usually has high tenacity. True or False?
Definition
True
Term
An increase in molecular weight increases the ________ of a fiber.
Definition
Tenacity
Term
Fiber A has denier of 90; fiber B has denier of 72.
Definition
7,000 meter fiber A weighs less than 9,000 meter fiber B
Term
Branches in a polymer ________ the molecular orientation of a fiber.
Definition
Decreases
Term
Hot air is used to evaporate solvent in ________ spinning
Definition
Dry
Term
The following formula is ________?
H2N—CH2—CH2—NH2
Definition
Amine
Term
A filament fiber with 750 meters weighs 5g. What is its denier?
Definition
51-60
Term
An increase in the size of a side group of a polymer increase the molecular orientation of a fiber made of the polymer.
Definition
False
Term
Which fiber formation method uses no solvents, therefore is most environmental friendly?
Definition
Melt spinning
Term
In the following polymerization formula, which is the repeating unit?
n CH2=CH -[-CH2—CH-]-n-
| |
CN CN
Definition
-CH2-CH- | CN
Term
n CH2=CH -[-CH2—CH-]-n-
| |
CN CN

What is the degree of polymerization if MW is 200,000?
Definition
3,751-3,999
Term
Which of the following groups exists in cotton?
Definition
OH
Term
Which of the above functional groups exists in acetate?
Definition
OH and COOCH3
Term
Which of the above functional groups exists in triacetate?
Definition
COOCH3
Term
Which of the above functional groups exists in wool fiber?
Definition
HNCO
Term
Which of the following are regenerated cellulose fibers?
Definition
Lyocell and rayon
Term
Which of the following man-made fibers is/are made during cellulose as raw material?
Definition
Rayon
Lyocell
Triacetate
Term
Which of the fibers swells when it is wet?
Definition
Cotton
Term
H-bonding with water exists in ________.
Definition
Cotton fiber
Term
Which of the following fibers has the highest elastic recovery?
Definition
Wool
Term
Which of the following fibers has cross-linkages between the molecules?
Definition
Wool
Term
The monomer for protein fiber is ________.
Definition
Amino acid
Term
Silk fiber has higher tenacity than wool because ________.
Definition
Its molecules have higher molecular orientation
Term
Which of the following fibers contains the most hydroxyl groups?
Definition
Rayon
Term
Cotton has low resiliency because ________.
Definition
Cellulose molecules form hydrogen bonding with each other
Term
Cotton has high moisture regain because ________.
Definition
Cellulose molecules form hydrogen bonding with water
Term
Which of the following in a cotton fiber is the main body of the fiber, at which most chemical reaction in dyeing and finishing takes place?
Definition
Secondary wall
Term
Which are the following fibers has the lowest moisture regain?
Definition
Triacetate
Term
Which of the following fibers has the highest molecular orientation?
Definition
Acetate
Term
The cuticle in cotton fiber’s macrostructure is ________?
Definition
Hydrophobic
Term
Which of the following fibers has the highest resiliency?
Definition
Triacetate
Term
What is the right order of the amount of hydrogen bonding between polymer molecules (HighestLowest)?
Definition
Rayon, acetate, triacetate
Term
Which of the following fibers can be bleached by chlorine bleaches?
Definition
Cotton and rayon
Term
I. Rayon (1) dry spinning
II. Acetate (2) wet spinning
Definition
I-(2), II-(1)
Term
Cotton has ________ molecular weight and ________ molecular orientation than rayon.
Definition
Higher, higher
Term
Which of the following fibers has amide groups in its repeating unit?
Definition
Wool
Term
Which of the following fibers becomes weaker when wet?
Definition
Rayon
Term
Which of the following fibers has poor dimensional stability?
Definition
Wool
Term
________ has lower elastic recovery and elongation.
Definition
Cotton
Term
High water temperature and alkaline detergent washing cause damage to rayon fabric.
Definition
False
Term
High alkalinity detergents cause damage to ________ fibers.
Definition
Wool
Term
Which of the following fibers has high luster?
Definition
Rayon
Term
Which of the following functional groups exists in a repeating unit of polyester?
Definition
C=O-O
Term
Which of the following functional groups exists in a repeating unit of nylon?
Definition
HNCO
Term
Which of the following functional groups exists in a repeating unit of polyacrylonitrile (acrylic)?
Definition
–CN
Term
Which of the following functional groups exists in a repeating unit of polyethylene?
Definition
None of the above
Term
A fiber containing 83% of the repeating units from polyacrylonitrile and 17% repeating units from vinyl chlorine is a ________ fiber.
Definition
Modacrylic
Term
Which of the following is the formula of polyethylene?
Definition
(-CH2-CH2-)n
Term
Which of the following is the monomer of polyethylene?
Definition
CH2=CH2
Term
Which of the following is the repeating unit of polyethylene?
Definition
-CH2-CH2-
Term
What is the DP of polyvinyl alcohol shown below given its MW=440,000?

(-CH2-CH-)n
|
OH
Definition
>9,800
Term
What are the monomers for the nylon-6,6 fiber?
Definition
COO(CH2)4COOH
NH2(CH2)6NH2
Term
Which of the following chemicals are used as the monomers for polyester?
Definition
HOOC-<=>-COOH
HOCH2CH2OH
Term
________ is the common monomer to produce the polymers for acrylic and modacrylic fibers.
Definition
CH2=CH | CN
Term
Which of the following fibers has the highest flame-resistance?
Definition
“Nomex”
Term
Which of the following fibers is made of copolymers?
Definition
Modacrylic
Term
Which of the following fibers is not produced by melt spinning?
Definition
Acrylic
Term
Which of the following fibers is made by melt spinning?
Definition
Polyester
Term
If nylon-6,6 and nylon-6 have the same molecular weight, which has higher degree of polymerization (DP)?
Definition
Nylon-6
Term
Which of the following is a branched polymer?
Definition
Low density polyethylene
Term
Which of the following has lower molecular orientation?
Definition
Low density polyethylene
Term
H O
| |
H-[-N-CH2-CH2-CH2-CH2-CH2-C-]-n
Definition
Nylon 6
Term
Which of the following fibers has the lowest moisture regain?
Definition
Polypropylene
Term
Which of the following fibers has the highest strength?
Definition
Polyester
Term
Which of the following fibers has the highest resistance to heat?
Definition
Aramid
Term
Which of the following fibers has the highest moisture regain and absorbency?
Definition
Nylon
Term
Nylon is used to make carpet, because it has high resistance to _________.
Definition
Abrasion
Term
Which of the following fibers has the lowest resistance to heat?
Definition
Polyolefin
Term
Which of the following fibers has the lowest resistance to heat?
Definition
Nylon
Term
We have two fabric samples (fabric A and fabric B). We know that those fabric samples are possibly 50-50 cotton/polyester fabric or 100% cotton. Fabric A has moisture regain of 8.5% and fabric B has moisture regain of 4.5%. Which is the 50-50 cotton-polyester fabric sample?
Definition
Fabric B
Term
Which of the following fibers is the most elastic?
Definition
Polyurethane
Term
Most synthetic fibers have ________ moisture regain ________ most nature fibers.
Definition
The same, as
Term
Most synthetic fibers have ________ tenacity ________ most nature fibers.
Definition
Higher, than
Term
Most synthetic fibers have ________ elastic recovery ________ most nature fibers.
Definition
Higher, than
Term
Most synthetic fibers have ________ resistance to chemicals ________ most nature fibers.
Definition
Higher, than
Term
The strength of a multifilament yarn ________ as number of twist per inch (TPI) increases in the yarn (without over twist).
Definition
Increases
Term
Texturing filament yarns increases ________.
Definition
Air/moisture permeability
Term
Twist is inserted during ________ in cotton yarn production.
Definition
Spinning
Term
Polyester and cotton is blended in ________ during the production of a polyester/cotton blend yarn.
Definition
Drawing
Term
Which of the fibers can be textured?
Definition
Polyester and Polyolefin
Term
Which of the following yarns has the highest heat-resistance?
Definition
Cotton
Term
Which of the following yarns has higher strength?
Definition
Yarns made using ring-spin technology
Term
Texturing filament yarn reduces ________ of fabric.
Definition
Abrasion resistance
Term
Which of the following spinning techniques to produce cotton yarns is faster and more cost effective?
Definition
Open-end spinning
Term
Which of the following yarn properties is reduced as the amount of twist (TPI) in a yarn is increased?
Definition
Insulation
Term
A cotton yarn has cotton count of 50, what is its denier? (1 M= 1.09 yd) (1 pound= 454g)
Definition
101-110
Term
A cotton yarn of 1,800 meters weighs 40 grams. What is its cotton count?
Definition
29-25
Term
Which part of a loom inserts a filing yarn?
Definition
Shuttle
Term
Which fabric is stronger?
Definition
Twill weave
Term
In nonwoven production, ________ is (are) used in a dry or wet process to form a web.
Definition
Staple fibers
Term
A polyester nonwoven fabric, which is made by a ________ process using ________, has continuous filament fibers in it.
Definition
Spun bonding, polymer
Term
Which of the following has the highest strength?
Definition
The polyester web made by a dry process and subjected to a mechanical bonding process
Term
An increase in bond density increases ________ of a nonwoven fabric.
Definition
Strength
Term
A polyester fiber web can be made by a ________ process using ________.
Definition
Spun bonding, polymer chips
Staple fibers
Term
A cotton fiber web can be made by using ________.
Definition
Staple fibers
Term
Which of the following web bonding methods results in the softest hand?
Definition
Mechanical
Term
Which of the following web bonding methods results in the highest strength?
Definition
Chemical
Term
“Point bonding,” in which thermoplastic fibers in a web at those heated “points” are molten to create fiber-to-fiber bonding, is one of the thermal bonding methods used in nonwoven industry. This method can be applied to webs made by ________ fiber.
Definition
Polyester
Term
Mechanical bonding results in ________ strength and ________ hand than thermal bonding.
Definition
Lower, softer
Term
Optical brighteners convert ________ lights to ________ lights.
Definition
UV, visible
Term
The purpose of sizing is to improve ________ of ________.
Definition
Abrasion resistance, warp yarn
Term
Chemical reactions (oxidation or reduction) take place during a ________ process.
Definition
Bleaching
Term
Sizing agent is applied to ________.
Definition
Before weaving fabrics
Term
Which of the following material is used for desizing cotton fabrics with starch as a sizing agent?
Definition
Enzyme
Term
Which of the following material is used for scouring cotton fabrics?
Definition
NaOH
Term
Wet preparation is carried ________ dyeing and ________ finishing.
Definition
Before, before
Term
“Waxes” and dirt on cotton fiber surface are removed during ________ process.
Definition
Scouring
Term
Which of the following material is used for mercerization of cotton fabrics?
Definition
NaOH
Term
Mercerization is a finishing process for
Definition
Cotton fabrics
Term
Mercerization increases ________ of cotton fabrics
Definition
Luster
Term
During preparation, bleaching takes place ________ desizing.
Definition
After
Term
Which preparation process changes the cross section shapes of cotton fiber?
Definition
Mercerization
Term
Fabric hand can be improved by ________.
Definition
Fabric softener
Term
Foam finishing is more energy efficient in ________.
Definition
Drying
Term
Cotton fleece has a highly “fuzzy” surface. This surface is created by a mechanical finishing process called ________.
Definition
Napping
Term
Soil-resistant finishes are hydrophobic.
Definition
True
Term
Which of the following finishes are most likely durable to 30 laundering cycles?
Definition
Durable press finishes
Term
Durable press finishes reduce ________ of cotton fabrics.
Definition
Strength
Term
Which water repellent finish is the most effective one?
Definition
FLurochemical
Term
In a durable press finishing process, cross-linking cellulose molecules takes place during the ________ step.
Definition
Curing
Term
Durable press finishing increases_____.
Definition
Dimensional stability
Term
What fiber is most flammable?
Definition
Cotton
Term
The current durable press finishing agents used by the industry contain formaldehyde (a carcinogen).
Definition
True
Term
Which is used for the coloration of polyolefin fibers?
Definition
Pigments
Term
Which dye has the best colorfastness to laundering?
Definition
Reactive dyes
Term
Fiber reactive dyes form covalent bonding with ________ fabrics.
Definition
Cotton and Nylon
Term
Which of the following dyes has charges in their molecules?
Definition
Acidic/basic dyes
Term
Which dye class requires high temperature pressure during a dyeing process?
Definition
Disperse Dyes
Term
Which dye has the lowest colorfastness to laundering?
Definition
Direct Dyes
Term
Which dyeing method is the most commonly used method in the industry?
Definition
Fabric Dyes
Term
Which dye are bound to fibers because of attraction between ions?
Definition
Acidic and Basic Dyes
Term
Which dye are used for polyester?
Definition
Disperse Dyes
Term
Which is a dye molecule determines the color of a dye?
Definition
Chromophores
Term
Some groups in a dyestuff molecule, such as those shown below, usually improve the solubility of the dye in water. These groups are called ________.
Definition
Auxochromes
Term
A vat dye has two forms: oxidized and reduced forms. Which is soluble in water?
Definition
Reduced
Term
Vat dyes are used on ________.
Definition
Cotton
Term
________ are not soluble in water and they disperse in a fiber in the form of particles during fiber spinning.
Definition
Pgments
Term
Which dye requires complete removal of residual dyes to avoid fabric damages?
Definition
Sulfur Dyes
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