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Design > Polymers - Thermosetting Plastics > Flashcards

Polymers - Thermosetting Plastics Flashcards

1
Q

What are the two groups?

Ivan K

A

Thermoplastics and Thermosetting plastics

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2
Q

Examples of Thermoplastics

Ivan K

A 
Acrylic
Polythene
Polypropylene
PET
ABS
PVC
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3
Q

Properties of ThermoPlastics

Ivan K

A

Will soften when heated
Tend to be flexible
Impact resistant
can be coloured

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4
Q

Examples of Thermosetting plastics

-Ivan k

A

GRP- Glass Reinforced polyester
Bakelite
Phenol
Epoxy Resin(e.g Araldite)

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5
Q

What is an efficient way of producing large quantities of identical plastic items?

Ivan K

A

Injection Moulding

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6
Q

Where are thermoplastics used?

A

Mechanical parts or even plastic bags

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7
Q

Are thermoplastics expensive to process?

A

No

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8
Q

Are thermoplastics recyclable?

A

Yes

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9
Q

Is Teflon a thermoplastic?

A

Yes

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10
Q

Is PVC a thermoplastic?

A

Yes

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11
Q

What is needed to start Injection Moulding?

-Oscar Lawson

A

Thermoplastics in granulated or powdered for which are fed into the hopper.

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12
Q

What is the rotating screw in the steel barrel of an injection moulder called?

-Oscar Lawson

A

Archimedes screw. It carries plastic from barrel to mould whilst the material is heated.

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13
Q

What happens once the thermoplastics have heated up (in injection moulding)

-Oscar Lawson

A

The hot material builds up at the ends before being injected into the mould.

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14
Q

What is the entrance into the cavity of the mould called?

-Oscar Lawson

A

A spruce

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15
Q

What steps are taken to ensure successful injection moulding?

-Oscar Lawson

A

The mould is heated beforehand to avoid setting the plastic too rapidly
Pressure is kept to prevent shrinkage. This returns a better product quality.

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16
Q

What are the properties of thermoplastics?

- Krystian Shanahan

A

Will soften when heated
Flexible
Impact resistant
Can be coloured

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17
Q

What is a CIM?

-Krystian Shanahan

A

Computer integrated manufacture

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18
Q

How is plastic fed into the injection moulding machine ?

-Krystian Shanahan

A

Through a hopper

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19
Q

Through what device is plastic injected into the mould?

-Krystian Shanahan

A

A sprue

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20
Q

Why is pressure maintained during dwell time?

-Krystian Shanahan

A

To prevent the material creeping back during setting

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21
Q

What is another name for Plastics?

  • Humphrey Marsh
A

Polymers

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22
Q

A plastic is made up of what?

  • Humphrey Marsh
A

A long chain of molecules

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23
Q

What defines the properties of a material?

  • Humphrey Marsh
A

How long chained molecules are linked together

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24
Q

The long chain molecules in thermosetting plastics are chemically tied by what and what links them?

  • Humphrey Marsh
A

Covalent bonds and they are cross-linked

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25
Q

Thermosets have little plasticity and are what?

  • Humphrey Marsh
A

Rigid

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26
Q

What is a downside of thermosetting plastics?

Yan K

A

They can only be formed once

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27
Q

What do thermoplastics have?

Yan K

A

Good heat resistance

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28
Q

What is UF used for?

Yan K

A

Electrical fittings, domestic appliance part, adhesives, coating paper, textile

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29
Q

What is MF used for?

Yan K

A

Tableware, decorative laminates for work surfaces, electrical insulation, buttons

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30
Q

What is PR used for?

Yan K

A

Casting, encapsulation, embedding, panels, boats, car bodies, chair shells, containers

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31
Q

In thermoplastics, what force holds the long chain molecules together?

-Oscar Mabon

A

Van der waals forces of attraction.

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32
Q

Is Acrylic a thermoplastic?

-Oscar Mabon

A

Yes

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33
Q

Is PVC a thermoplastic?

-Oscar Mabon

A

Yes

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34
Q

Is Polythene a thermoplastic?

-Oscar Mabon

A

Yes

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35
Q

Is Polypropylene a thermoplastic?

-Oscar Mabon

A

Yes

36
Q

Can Melamine Formaldehyde sheets be printed and laminated onto Particle Boards?

Caspar Tyser

A

Yes

37
Q

Compression Moulding requires………?

Caspar Tyser

A

Heat and Pressure

38
Q

Can Thermosetting Plastics be re-heated and moulded after they have already been heated and moulded?

Caspar Tyser

A

No

39
Q

Can Thermoplastics be re- heated and moulded once this cycle has already occurred?

Caspar Tyser

A

Yes

40
Q

Thermosetting plastics are tied by covalent bonds and are…?

Caspar Tyser

A

Cross-linked

41
Q

What is GRP short for?

-Oscar Lawson

A

Glass reinforced paper

42
Q

What does a hardener do to epoxy resin?

-Oscar Lawson

A

Causes a reaction forming crosslinking between the long chain molecules

43
Q

What is urea formaldehyde used for?

-Oscar Lawson

A

Electrical fittings like plug sockets, wood adhesives and laminating particle boards such as MDF

44
Q

What would you use melamine for?

-Oscar Lawson

A

Plastic plates and cups as it is very heat resistant and can be printed and coloured

45
Q

How does compression moulding work?

-Oscar Lawson

A

Powder is measured out and placed into a mould. The mould is closed under pressure and heat, curing the plastic.

46
Q

What are long chain molecules held together by?

Nathan P

A

Forces of attraction called van der waals

47
Q

What allows thermoplastics to be reformed and moulded?

Nathan P

A

The fact that they soften when heated

48
Q

Properties of thermoplastics:

Nathan P

A

Soften when heated
Tend to be flexible
Impact resistant
Can be coloured

49
Q

How many times can thermosetting plastics be moulded?

Nathan P

A

Only once, then they are permanently rigid.

50
Q

Injection moulding uses what kind of plastics?

Nathan P

A

Thermoplastics

51
Q

What are the two groups of plastics?

Torsai K

A

Thermoplastic and Thermosetting plastics

52
Q

What is injection moulding?

Torsai K

A

The process is used to produce large quantities of identical plastic items

53
Q

What are examples of thermoplastics?

Torsai K

A

Acrylic, Polythene, Polypropelene, PET, ABS, PVC

54
Q

What are the characteristics of thermoplastics?

Torsai K

A

Thermoplastics soften when heated, tend to be flexible, are impact resistant, and can be coloured.

55
Q

Why is injection moulding only reserved for volume production?

Torsai K

A

Moulds can be quite expensive. Due to the high cost, moulding should be reserved for volume production

56
Q

What is epoxy resin used for?

-Ssnehnil G

A

It acts like a glue

57
Q

Use of Urea Formaldehyde?

-Ssnehnil G

A

Electrical fittings, plugs and sockets

58
Q

What does GRP stand for?

-Ssnehnil G

A

Glass Reinforced Polyester

59
Q

What is Phenol Formaldehyde also known as?

  • Ssnehnil G
A

Bakelite

60
Q

Are thermosetting plastics rigid?

-Ssnehnil G

A

Yes

61
Q

What is plastic?

Torsai K

A

Plastics are a group of materials which are ‘plastic’ at some point in the manufacturing process

62
Q

What are examples of thermosetting plastics?

Torsai K

A

GRP, Melamine, Bakelite, Urea Formaldehyde, and Epoxy resin (Araldite).

63
Q

How are thermoplastics different from thermosetting plastics?

Torsai K

A

A thermoplastic will soften when heated; a thermosetting plastic will not.

64
Q

Characteristics of thermosetting plastics.

Torsai K

A

Thermosetting plastics withstand higher temperatures without losing rigidity and are good insulators.

65
Q

How do thermosetting plastics form?

Torsai K

A

Thermosetting plastics begin as long-chain molecules but become chemically tied and are cross-linked when polymer cures.

66
Q

What is compression moulding?

Torsai K

A

A precise amount of powder is placed in a mould, closed under pressure with heat applied, and plastic cures.

67
Q

Are thermosetting plastics recyclable?

A

No

68
Q

What type of molecular structure do thermosetting plastics have?

A

Rigid

69
Q

How are the What type in thermosetting plastics linked?

A

Cross-linked

70
Q

What process are thermoplastics made through?

A

Cross-linked

71
Q

Do thermosetting plastics soften under heating?

A

No

72
Q

What is a plastic?

-Lucas M

A

A material that is ‘plastic’ at some point in the manufacturing process.

73
Q

What force of attraction holds thermoplastics together?

-Lucas M

A

Van Der Waals forces of attraction.

74
Q

Why can thermoplastics be reformed multiple times?

-Lucas M

A

It softens when heated.

75
Q

Which thermosetting plastic resists heat to 250 degrees Celsius?

-Lucas M

A

Epoxy resin

76
Q

Which thermosetting plastic is scratch resistant and comes in a wide range of colours?

-Lucas M

A

Melamine-formaldehyde

77
Q

What are plastics also known as?

Nathan P

A

Polymers

78
Q

Melamine can be…

Nathan P

A

Printed, coloured and is resistant to heat

79
Q

Laminating can make a particle board…

Nathan P

A

Hard, coloured and heat resistant

80
Q

GRP stands for…

Nathan P

A

Glass reinforced polyester

81
Q

What is required for epoxy resin to set?

Nathan P

A

Resin and hardener

82
Q

How many times can thermosetting plastics be formed?

-Alfie Turner

A

once

83
Q

Do thermosetting plastics have good resistance to heat?

-Alfie Turner

A

YES

84
Q

Thermoplastics have little plasticity and are …?

-Alfie Turner

A

rigid

85
Q

What does epoxy resin require to set?

-Alfie Turner

A

A hardener

86
Q

How can melanin be used?

-Alfie Turner

A

Printing, colouring and its resistant to heat

Design (31 decks)

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