Term
What is the functional group of:
CH3-CH2-OH |
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Definition
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Term
What is the functional group of:
HO-CH2-CH2-OH |
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Definition
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Term
What is the functional group of:
H2N-CH2-CH2-NH2 |
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Definition
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Term
What is the functional group of:
CH3OOC=COOCH3 |
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Definition
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Term
What is the functional group of:
COOH=COOH |
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Definition
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Term
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Definition
| CH3-O-C=O----------O=C-O-CH3 |
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Term
| What is the monomer of polypropylene shown below? [-CH-CH2]-CH3 (5,000) |
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Definition
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Term
| All man made fibers can be stretched to reduce fiber tenacity when they are formed during a spinning process. True or False? |
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Definition
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Term
Which of the following has the highest degree of polymerization?
(-CH2-CH2-)-2300
(-CH2-CH-CH-CH2-CH3)-2300
(-CH-CH2-)-2300 |
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Definition
| A,B, and C have the same degree of polymerization. |
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Term
Which has the highest molecular weight?
a. (-CH2-CH2-)-2300
b. (-CH2-CH-CH-CH2-CH3)-2300
c. (-CH-CH2-)-2300 |
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Definition
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Term
| In the following strength-elongation plot, the breaking elongation of "Fiber A" is approximately ____ of that of "Fiber B." |
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Definition
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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 (%)? |
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Definition
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Term
| A fiber with high molecular orientation usually has high tenacity. True or False? |
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Definition
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Term
| An increase in molecular weight increases the ________ of a fiber. |
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Definition
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Term
| Fiber A has denier of 90; fiber B has denier of 72. |
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Definition
| 7,000 meter fiber A weighs less than 9,000 meter fiber B |
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Term
| Branches in a polymer ________ the molecular orientation of a fiber. |
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Definition
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Term
| Hot air is used to evaporate solvent in ________ spinning |
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Definition
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Term
The following formula is ________?
H2N—CH2—CH2—NH2 |
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Definition
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Term
| A filament fiber with 750 meters weighs 5g. What is its denier? |
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Definition
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Term
| An increase in the size of a side group of a polymer increase the molecular orientation of a fiber made of the polymer. |
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Definition
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Term
| Which fiber formation method uses no solvents, therefore is most environmental friendly? |
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Definition
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Term
In the following polymerization formula, which is the repeating unit?
n CH2=CH -[-CH2—CH-]-n-
| |
CN CN |
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Definition
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Term
n CH2=CH -[-CH2—CH-]-n-
| |
CN CN
What is the degree of polymerization if MW is 200,000? |
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Definition
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Term
| Which of the following groups exists in cotton? |
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Definition
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Term
| Which of the above functional groups exists in acetate? |
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Definition
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Term
| Which of the above functional groups exists in triacetate? |
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Definition
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Term
| Which of the above functional groups exists in wool fiber? |
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Definition
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Term
| Which of the following are regenerated cellulose fibers? |
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Definition
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Term
| Which of the following man-made fibers is/are made during cellulose as raw material? |
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Definition
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Term
| Which of the fibers swells when it is wet? |
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Definition
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Term
| H-bonding with water exists in ________. |
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Definition
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Term
| Which of the following fibers has the highest elastic recovery? |
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Definition
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Term
| Which of the following fibers has cross-linkages between the molecules? |
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Definition
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Term
| The monomer for protein fiber is ________. |
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Definition
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Term
| Silk fiber has higher tenacity than wool because ________. |
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Definition
| Its molecules have higher molecular orientation |
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Term
| Which of the following fibers contains the most hydroxyl groups? |
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Definition
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Term
| Cotton has low resiliency because ________. |
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Definition
| Cellulose molecules form hydrogen bonding with each other |
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Term
| Cotton has high moisture regain because ________. |
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Definition
| Cellulose molecules form hydrogen bonding with water |
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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? |
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Definition
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Term
| Which are the following fibers has the lowest moisture regain? |
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Definition
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Term
| Which of the following fibers has the highest molecular orientation? |
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Definition
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Term
| The cuticle in cotton fiber’s macrostructure is ________? |
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Definition
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Term
| Which of the following fibers has the highest resiliency? |
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Definition
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Term
| What is the right order of the amount of hydrogen bonding between polymer molecules (HighestLowest)? |
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Definition
| Rayon, acetate, triacetate |
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Term
| Which of the following fibers can be bleached by chlorine bleaches? |
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Definition
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Term
I. Rayon (1) dry spinning
II. Acetate (2) wet spinning |
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Definition
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Term
| Cotton has ________ molecular weight and ________ molecular orientation than rayon. |
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Definition
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Term
| Which of the following fibers has amide groups in its repeating unit? |
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Definition
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Term
| Which of the following fibers becomes weaker when wet? |
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Definition
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Term
| Which of the following fibers has poor dimensional stability? |
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Definition
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Term
| ________ has lower elastic recovery and elongation. |
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Definition
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Term
| High water temperature and alkaline detergent washing cause damage to rayon fabric. |
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Definition
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Term
| High alkalinity detergents cause damage to ________ fibers. |
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Definition
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Term
| Which of the following fibers has high luster? |
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Definition
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Term
| Which of the following functional groups exists in a repeating unit of polyester? |
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Definition
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Term
| Which of the following functional groups exists in a repeating unit of nylon? |
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Definition
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Term
| Which of the following functional groups exists in a repeating unit of polyacrylonitrile (acrylic)? |
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Definition
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Term
| Which of the following functional groups exists in a repeating unit of polyethylene? |
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Definition
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Term
| A fiber containing 83% of the repeating units from polyacrylonitrile and 17% repeating units from vinyl chlorine is a ________ fiber. |
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Definition
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Term
| Which of the following is the formula of polyethylene? |
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Definition
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Term
| Which of the following is the monomer of polyethylene? |
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Definition
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Term
| Which of the following is the repeating unit of polyethylene? |
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Definition
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Term
What is the DP of polyvinyl alcohol shown below given its MW=440,000?
(-CH2-CH-)n
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OH |
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Definition
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Term
| What are the monomers for the nylon-6,6 fiber? |
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Definition
COO(CH2)4COOH
NH2(CH2)6NH2 |
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Term
| Which of the following chemicals are used as the monomers for polyester? |
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Definition
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Term
| ________ is the common monomer to produce the polymers for acrylic and modacrylic fibers. |
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Definition
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Term
| Which of the following fibers has the highest flame-resistance? |
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Definition
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Term
| Which of the following fibers is made of copolymers? |
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Definition
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Term
| Which of the following fibers is not produced by melt spinning? |
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Definition
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Term
| Which of the following fibers is made by melt spinning? |
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Definition
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Term
| If nylon-6,6 and nylon-6 have the same molecular weight, which has higher degree of polymerization (DP)? |
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Definition
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Term
| Which of the following is a branched polymer? |
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Definition
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Term
| Which of the following has lower molecular orientation? |
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Definition
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Term
H O
| |
H-[-N-CH2-CH2-CH2-CH2-CH2-C-]-n |
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Definition
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Term
| Which of the following fibers has the lowest moisture regain? |
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Definition
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Term
| Which of the following fibers has the highest strength? |
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Definition
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Term
| Which of the following fibers has the highest resistance to heat? |
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Definition
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Term
| Which of the following fibers has the highest moisture regain and absorbency? |
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Definition
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Term
| Nylon is used to make carpet, because it has high resistance to _________. |
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Definition
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Term
| Which of the following fibers has the lowest resistance to heat? |
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Definition
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Term
| Which of the following fibers has the lowest resistance to heat? |
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Definition
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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? |
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Definition
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Term
| Which of the following fibers is the most elastic? |
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Definition
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Term
| Most synthetic fibers have ________ moisture regain ________ most nature fibers. |
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Definition
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Term
| Most synthetic fibers have ________ tenacity ________ most nature fibers. |
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Definition
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Term
| Most synthetic fibers have ________ elastic recovery ________ most nature fibers. |
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Definition
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Term
| Most synthetic fibers have ________ resistance to chemicals ________ most nature fibers. |
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Definition
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Term
| The strength of a multifilament yarn ________ as number of twist per inch (TPI) increases in the yarn (without over twist). |
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Definition
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Term
| Texturing filament yarns increases ________. |
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Definition
| Air/moisture permeability |
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Term
| Twist is inserted during ________ in cotton yarn production. |
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Definition
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Term
| Polyester and cotton is blended in ________ during the production of a polyester/cotton blend yarn. |
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Definition
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Term
| Which of the fibers can be textured? |
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Definition
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Term
| Which of the following yarns has the highest heat-resistance? |
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Definition
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Term
| Which of the following yarns has higher strength? |
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Definition
| Yarns made using ring-spin technology |
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Term
| Texturing filament yarn reduces ________ of fabric. |
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Definition
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Term
| Which of the following spinning techniques to produce cotton yarns is faster and more cost effective? |
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Definition
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Term
| Which of the following yarn properties is reduced as the amount of twist (TPI) in a yarn is increased? |
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Definition
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Term
| A cotton yarn has cotton count of 50, what is its denier? (1 M= 1.09 yd) (1 pound= 454g) |
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Definition
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Term
| A cotton yarn of 1,800 meters weighs 40 grams. What is its cotton count? |
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Definition
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Term
| Which part of a loom inserts a filing yarn? |
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Definition
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Term
| Which fabric is stronger? |
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Definition
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Term
| In nonwoven production, ________ is (are) used in a dry or wet process to form a web. |
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Definition
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Term
| A polyester nonwoven fabric, which is made by a ________ process using ________, has continuous filament fibers in it. |
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Definition
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Term
| Which of the following has the highest strength? |
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Definition
| The polyester web made by a dry process and subjected to a mechanical bonding process |
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Term
| An increase in bond density increases ________ of a nonwoven fabric. |
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Definition
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Term
| A polyester fiber web can be made by a ________ process using ________. |
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Definition
Spun bonding, polymer chips
Staple fibers |
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Term
| A cotton fiber web can be made by using ________. |
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Definition
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Term
| Which of the following web bonding methods results in the softest hand? |
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Definition
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Term
| Which of the following web bonding methods results in the highest strength? |
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Definition
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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. |
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Definition
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Term
| Mechanical bonding results in ________ strength and ________ hand than thermal bonding. |
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Definition
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Term
| Optical brighteners convert ________ lights to ________ lights. |
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Definition
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Term
| The purpose of sizing is to improve ________ of ________. |
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Definition
| Abrasion resistance, warp yarn |
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Term
| Chemical reactions (oxidation or reduction) take place during a ________ process. |
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Definition
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Term
| Sizing agent is applied to ________. |
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Definition
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Term
| Which of the following material is used for desizing cotton fabrics with starch as a sizing agent? |
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Definition
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Term
| Which of the following material is used for scouring cotton fabrics? |
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Definition
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Term
| Wet preparation is carried ________ dyeing and ________ finishing. |
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Definition
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Term
| “Waxes” and dirt on cotton fiber surface are removed during ________ process. |
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Definition
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Term
| Which of the following material is used for mercerization of cotton fabrics? |
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Definition
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Term
| Mercerization is a finishing process for |
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Definition
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Term
| Mercerization increases ________ of cotton fabrics |
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Definition
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Term
| During preparation, bleaching takes place ________ desizing. |
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Definition
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Term
| Which preparation process changes the cross section shapes of cotton fiber? |
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Definition
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Term
| Fabric hand can be improved by ________. |
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Definition
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Term
| Foam finishing is more energy efficient in ________. |
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Definition
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Term
| Cotton fleece has a highly “fuzzy” surface. This surface is created by a mechanical finishing process called ________. |
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Definition
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Term
| Soil-resistant finishes are hydrophobic. |
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Definition
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Term
| Which of the following finishes are most likely durable to 30 laundering cycles? |
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Definition
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Term
| Durable press finishes reduce ________ of cotton fabrics. |
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Definition
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Term
| Which water repellent finish is the most effective one? |
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Definition
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Term
| In a durable press finishing process, cross-linking cellulose molecules takes place during the ________ step. |
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Definition
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Term
| Durable press finishing increases_____. |
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Definition
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Term
| What fiber is most flammable? |
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Definition
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Term
| The current durable press finishing agents used by the industry contain formaldehyde (a carcinogen). |
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Definition
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Term
| Which is used for the coloration of polyolefin fibers? |
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Definition
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Term
| Which dye has the best colorfastness to laundering? |
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Definition
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Term
| Fiber reactive dyes form covalent bonding with ________ fabrics. |
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Definition
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Term
| Which of the following dyes has charges in their molecules? |
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Definition
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Term
| Which dye class requires high temperature pressure during a dyeing process? |
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Definition
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Term
| Which dye has the lowest colorfastness to laundering? |
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Definition
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Term
| Which dyeing method is the most commonly used method in the industry? |
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Definition
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Term
| Which dye are bound to fibers because of attraction between ions? |
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Definition
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Term
| Which dye are used for polyester? |
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Definition
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Term
| Which is a dye molecule determines the color of a dye? |
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Definition
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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 ________. |
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Definition
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Term
| A vat dye has two forms: oxidized and reduced forms. Which is soluble in water? |
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Definition
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Term
| Vat dyes are used on ________. |
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Definition
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Term
| ________ are not soluble in water and they disperse in a fiber in the form of particles during fiber spinning. |
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Definition
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Term
| Which dye requires complete removal of residual dyes to avoid fabric damages? |
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Definition
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