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MSE 2034 > Test 3 > Flashcards

Test 3 Flashcards

1
Q

Contrast thermoplastic and thermosetting materials.

A 
thermoplastics have little crosslinking
thermosets have significant crosslinking
thermoplastics soften with heating
thermosets do not soften with heating
thermosets are hard and brittle
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2
Q

List some thermoplastic materials

A

polyethylene
polypropylene
polycarbonate
polystyrene

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3
Q

List some thermosets

A

vulcanized rubber
epoxies
polyester resin
phenolic resin

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4
Q

For an ionic ceramic compound, what are the characteristics that determine the crystal structure?

A

relative ion size and ion valence

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5
Q

What is the coordination number and rc/ra range for the rock salt (NaCl) crystal structure?

A

6

0.414-0.732

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6
Q

What is the coordination number and rc/ra range for the Cesium Chloride (CsCl) crystal structure?

A

8

0.732-1.000

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7
Q

What is the coordination number and rc/ra range for the Zinc Blende (ZnS) crystal structure?

A

4

0.225-0.414

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8
Q

What kind of bonds are found in ceramics?

A

ionic and covalent

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9
Q

What is the formula for an aromatic ring?

A

C6H4

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10
Q

What does tau_c represent?

A

fiber matrix bond strength or matrix shear yield strength

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11
Q

sigma_cd’ represents what?

A

Longitudinal tensile strength for discontinuous

and aligned fibrous composite and l < lc

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12
Q

What does sigma’m represent?

A

Stress in matrix at composite failure

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13
Q

What does sigma*f represent?

A

fiber tensile strength

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14
Q

What does K represent?

A

fiber-efficiency parameter?

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15
Q

What is the value of K if all fibers are parallel and the stress is parallel to the fibers?

A

1

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16
Q

What is the value of K if all fibers all parallel and the stress is perpendicular to the fibers?

A

0

17
Q

What is the value of K if the fibers are randomly and uniformly distributed within a specific plane and the stress is in any direction in the plane of the fibers??

A

3/8

18
Q

What is the value of K if the fibers are randomly and uniformly distributed within three dimensions in space and the stress is in any direction?

A

1/5

19
Q

List the three kinds of tacticity in order of decreasing regularity.

A

isotactic, syndiotactic, atactic

20
Q

Describe the Rock Salt (NaCl) crystal structure.

A

Both Na and Cl are arranged in FCC pattern. Na+ is in the shifted pattern.

21
Q

Describe the Cesium Chloride (CsCl) crystal structure.

A

Octahedral with Cs+ in the middle. Looks like BCC.

22
Q

Describe the Zinc Blende (ZnS) crystal structure.

A

The sulfur looks like FCC. Zinc is in the tetrahedral sites.

23
Q

What causes Tg and Tm to increase?

A

increasing chain stiffness

24
Q

What increases chain stiffness?

A
  • bulky sidegroups
  • polar groups or sidegroups
  • chain double bonds or aromatic chain groups
25
Q

What affects Tm only?

A

The regularity of repeat units

MSE 2034 (4 decks)

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