Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

materials exam upload > Plastics > Flashcards

Plastics Flashcards

1
Q

What are the three states of fluids and solids?

A

Viscous, Visco-elastic, Elastic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the three Polymer Synthesis methods?

A

Polymerization, Polycondensation, and Polyaddition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the three types of polymerization?

A

Radical, Ionic, Coordinative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are some examples of polymers formed by polymerization?

A
  • Polyvinyl Chloride
  • Polyethylene
  • Polystyrene
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is polycondensation?

A

Monomers with functional groups react to form polymer.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is polyaddition?

A

Two different monomers react to form a polymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the three main categories of plastics?

A
  • Thermoplastics
  • Elastomers
  • Thermosets
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the three types of copolymers?

A
  • Alternating copolymer
  • Statistical copolymer
  • Block copolymer
  • Graft copolymer
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the steps for the recycling of thermoplastics?

A
  • Shredding
  • Washing
  • Drying
  • Melting
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are some properties of thermosets? (7)

A
  1. Few plastics are thermosets
  2. Cross-linked polymer with 3-D network structure
  3. Covalent bonds linking the chains
  4. Stiff and brittle
  5. Temperature resistant
  6. Non-meltable
  7. Heat loosens bonds
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the typical components of thermosets?

A
  1. Resin
  2. Curing Agent
  3. Accelerator
  4. Hardener
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the production categories of plastics?(3)

A
  • High-performance Plastics
  • Technical Plastics
  • Mass Plastics
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are some important plastics?

A
  1. Phenolic resin
  2. Epoxy resin
  3. Unsaturated polyester
    resin
  4. Polyimides
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the three types of curing for plastics?

A
  1. Warm Curing
  2. Cold Curing
  3. Light Curing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Is curing endothermic or exothermic?

A

Exothermic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How do viscosity and temperature vary with time during curing?

A

Temperature increases then decreases

Viscosity decreases then increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is gel point?

A

Point after which resin can no longer be processed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is degree of cure?

A

The percentage of resin that has cured.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the main characteristics of thermosets?(7)

A
  1. Undergo curing
  2. Low strain to failure
  3. Low fracture energy
  4. Irreversible processing
  5. Very low viscosity
  6. Absorb moisture
  7. Resistant to solvents
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the advantages of thermosets? (6)

A
  1. Low processing temperature
  2. Good compression properties
  3. Resistant to creep
  4. Good fatigue properties
  5. Formable into complex shapes
  6. Highly resistant to solvents
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What are the disadvantages of thermosets? (6)

A
  1. Long processing time
  2. Long cure
  3. Low ductility
  4. Low fracture toughness
  5. Low impact resistance
  6. Absorb moisture
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What are some examples of epoxy resins?(3)

A
  • Araldite
  • UHU
  • EPON
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are some properties of epoxy resins?

A
  • Weather resistant
  • Good insulating
    properties
  • Low shrinkage
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What are some examples of phenolic resins? (3)

A
  • Bakelit
  • Korex
  • Vyntec
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What are some properties of phenolic resins? (3)

A
  • Very high stiffness compared to other polymers
  • Low creep deformation
  • Good fire properties
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What are some properties of unsaturated polyester resins?

A
  • High to very high stiffness and hardness
  • Unresistant to permanent influence of hot water
  • Yellow under sunlight, but weather resistant
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What are some examples of polyamides? (3)

A
  • Pl-film
  • Pl-semi-finished product
  • PMBI
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What are some properties of polyamides? (4)

A
  • High strength and stiffness
  • Self extinguishing
  • Used as both thermoplastics and thermosets
  • Very good wear and sliding behavior
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What are some basic properties of thermoplastics? (5)

A
  1. Absorb little moisture
  2. Limited resistance to
    organic solvents
  3. High strain to failure
  4. Reversible processing
  5. No curing required
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

What are the three classifications of thermoplastics?

A
  • Standard Plastics
  • Engineering Plastics
  • High-performance
    plastics
31
Q

What does morphology mean?

A

Order/arrangement of a polymer structure.

32
Q

What two morphologies exist in thermoplastics?

A
  • Amorphous
  • Semi-crystalline
33
Q

What is the synthesis process for polyethene?

A

Radical or catalytic chain-growth polymerization.

34
Q

What are the three types of polyethene?

A
  • PE-HD
  • PE-LD
  • PE-LLD
35
Q

What is polyethene resistant to? (5)

A
  • Acids
  • Bases
  • Polar organic liquids
  • Oils
  • Fats
36
Q

What is polyethene not resistant to? (3)

A
  • Hydrocarbons
  • Chlorinated
    hydrocarbons
  • Oxidizing agents
37
Q

How is PE-LD processed?

A

Extrusion

38
Q

How is PE-HD processed?

A

Injection/Blow molding

39
Q

How is poly propylene synthesised?

A

Catalytic chain-growth polymerization

40
Q

How is polypropylene processed? (4)

A
  • Injection Molding
  • Extrusion
  • Compression Molding
  • Calendering
41
Q

What is polypropylene not resistant to?

A

Strong oxidizing agents

42
Q

How is PVC synthesised?

A

Radical polymerization of vinyl chloride in the liquid phase under pressure.

43
Q

How is PVC differentiated by polymerization process? (3)

A
  1. PVC-E: Emulsion
  2. PVC-S: Suspension
  3. PVC-M: Mass
44
Q

How is PVC differentiated by properties?(2)

A

PVC-U: Unplasticized, rigid
PVC-P: Plasticized, soft

45
Q

How is PVC-U processed? (6)

A
  • Extrusion
  • Calendaring
  • Injection Molding
  • Blow Molding
  • Sintering
  • Compression Molding
46
Q

What is PVC-U resistant to? (5)

A
  • Acids
  • Bases
  • Aliphatic Hydrocarbons
  • Oils
  • Fats and Alcohols
47
Q

What is PVC-U not resistant to? (3)

A
  • Aromatic and Chlorinated hydrocarbons
  • Ketones
  • Esters
48
Q

How is PVC-P processed?(6)

A
  • Extrusion
  • Calendaring
  • Injection Molding
  • Film Blowing
  • Blow Molding
  • Compression Molding
49
Q

What is PVC-P resistant to? (3)

A
  • Diluted acid/base
  • Salt solutions
  • Cleaning Agents
50
Q

What is PVC-P not resistant to? (1)

A

All organic fluids

51
Q

How is polystyrene synthesised?

A

Radical chain polymerization

52
Q

What are the three types of polystyrene?

A

atactic, isotactic, and synotactic

53
Q

How is polystyrene processed?

A

(Injection molding, extrusion, thermo forming, injection blow molding)

54
Q

What is polystyrene resistant to? (5)

A

Bases, acids, alcohols, fats, oils

55
Q

What is polystyrene not resistant to?

A

Hydrocarbons, halogen hydrocarbons, esters, ketones

56
Q

How is polymethyl methacrylate synthesised?

A

Chain Polymerization

57
Q

How is polymethyl methacrylate processed? (3)

A
  • Extrusion
  • Injection Molding
  • Thermo forming
58
Q

What is Polymethyl methacrylate resistant to? (2)

A
  • Light acids and bases
  • Non-polar solvents
59
Q

What is Polymethyl methacrylate not resistant to? (1)

A

Polar solvents

60
Q

How is polycarbonate synthesized?

A

Polycondensation

61
Q

How is Polycarbonate processed?

A
  • Injection molding
  • Extrusion
  • Blow molding
  • Thermoforming
62
Q

What is polycarbonate resistant to? (4)

A
  • Diluted acids
  • Fuel
  • Oils
  • Ethanol
63
Q

What is polycarbonate not resistant to? (5)

A
  • bases
  • concentrated acids
  • ketones
  • esters
  • aromatic and halogenated hydrocarbons
64
Q

How is polyamide synthesized?

A

Polycondensation

65
Q

How is polyamide processed?

A

Injection molding

66
Q

What are some examples of nitrogenous thermoplastics? (3)

A
  • Polyurethane
  • Polyamide
  • Polyacrylonitrile
67
Q

How is polytetrafluoroethylene synthesized?

A

Chain polymerization

68
Q

What is another name for polytetraflouroethylene?

A

Teflon

69
Q

What is PAEK?

A

Polyaryletherketone

70
Q

What is PEEK?

A

Polyether ether ketone

71
Q

What are some processes for primary shaping of Plastics?(7)

A
  1. Extrusion
  2. Injection Molding
  3. Blow Molding
  4. Compression Molding
  5. Calendaring
  6. Spinning
  7. Casting
72
Q

What are some methods used for forming of plastics? (1)

A

Thermo-forming

73
Q

Why are thermoplastics used in aerospace? (7)

A
  1. Non-reacting
  2. Rapid processing
  3. High ductility
  4. High fracture toughness
  5. High impact resistance
  6. Absorb little moisture
  7. Can be recycled
74
Q

What are some disadvantages of thermoplastics in aerospace? (4)

A
  • High viscosity
  • High processing
    temperature
  • Poor creep resistance
  • High processing pressure

materials exam upload (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions