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TMS 211 > Test 2 > Flashcards

Test 2 Flashcards

1
Q

What fiber is best suited for parachute rope?

A

Nylon

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2
Q

Which manufactured fibers are stiffness according to inital modulus?

A

olefin and polyester

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3
Q

which natural fiber has the greatest ultimate strain?

A

wool

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4
Q

which natural fiber has the greatest inital modulus (Stiffness)?

A

flax

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5
Q

the elastic stiffness of a fiber is determined from what parameters?

A

yield stress and yield strain

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6
Q

Work of Rupture describes what important characterisitcs of fiber

A

the total work absorbed by a fiber before it breaks

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7
Q

Resilience is a measure of what?

A

a measure of recoverable work and the ability of a fiber to return to its orginial shape

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8
Q

When a fiber ties into a knot..?

A

the fiber becomes weaker and the knot acts to increase the stress on the fiber

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9
Q

standard laboratatory conditions for the mechanical testing is

A

65 +/- 2% relative humidity and 70+/- 2 degrees fahrenheight

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10
Q

the yield point refers to…?

A

found by Merediths method for viscoelastic materials and the point where elastic deformation turns to plastic deformation.

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11
Q

If you are a fisherman do you want your clothes to be hydrophobic or hydrophilic?

A

hydrophobic

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12
Q

Is wool hydrophobic or hydrophilic?

A

hydrophilic

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13
Q

which fiber has the lowest melting temp?

A

polypropylene

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14
Q

glass transition temp is ..?

A

dependent on mositure regain and temp at which polymer chains in the amorphous part of fibers to be mobile

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15
Q

heat of wetting is?

A

heat generated when a fiber absorbs mositure

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16
Q

a hydrophilic fiber is one that…?

A

absorbs mositure readily

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17
Q

An oleophilic fiber is one that…?

A

tenaciously absorbs or holds oil

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18
Q

Is polyester hydrophobic or hydrophilic?

A

hydrophobic

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19
Q

Is polypropylene hydrophobic or hydrophilic?

A

hydrophobic

20
Q

Relative humidty affects the properties of _ fibers.

A

hydrophillic

21
Q

T or F: Cotton and wool have no melting temp because the polymers will decompose into other molecules before they become liquid.

A

True

22
Q

Cotton is more damaged by …

A

Acids (low pH)

23
Q

Consumers find cotton to be comfortable because…

A

when dry and because cotton is hydrophillic

24
Q

The color of cotton is…

A

white, grey, light yellow

25
Q

Cotton fibers are primarly from what polymer?

A

cellulose

26
Q

the mositure regain of cotton at standard lab settings is…

A

8.5%

27
Q

the melting point of cotton is …

A

cotton will decompose before it melts

28
Q

T or F: cotton fiber length is highly variable due to the processing of the fiber beginning with ginning.

A

true

29
Q

T or F: Cotton is highly flammable unless treated with a flame retardant finsihing

A

true

30
Q

T or F: cotton is stronger than polyester

A

false

31
Q

T or F:during a tensile test, cotton has a very low elognation at the breaking point.

A

true

32
Q

T or F: cotton will absorb moisture and phyiscally swell

A

true

33
Q

T or F: cotton fiber properties are highly variable because it is a natural fiber with varying growing conditions.

A

true

34
Q

T or F: wool fiber length is highly variable due to the fact that wool on a sheep’s leg is shorter than wool on the sheeps back.

A

true

35
Q

T or F: wool and silk will absorb mositure and phyiscally swell

A

true

36
Q

T or F: during a tensile test, wool has a very low elongation at the breaking point

A

false

37
Q

mositure regain of silk at standard lab conditions is

A

11%

38
Q

consumers find silk fabrics to be comfortable

A

because it is hydrophilic fiber, when dry, because silk fabrics have excellent drape characterisitcs

39
Q

T or F: most natural and manufactured fibers have greater breaking strength than wool.

A

true

40
Q

T or F: individual silk filaments can have a length of several hundred meters.

A

true

41
Q

The melting point of wool and silk

A

they don’t have a melting point because they will decompose before melting

42
Q

the color of wool is

A

white, grey, brown

43
Q

During melt spinning the spinneret provides what value to the process?

A

It creates the filament cross sectional shape

44
Q

What part of the melt spinning extrusion unit forces the melted polymer to the metering pump?

A

the screw

45
Q

In order to be formed into filaments using melt spinning, a polymer must be:

A

Capable of being melted, have a large degree of polymerization in order for the filament to be strong enough and not break

46
Q

what part of the melt spinning extrusion unit forces the melted polymer to the spinneret with a uniform flow rate?

A

metering pump

TMS 211 (4 decks)

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