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Design > Polymers > Flashcards

Polymers Flashcards

1
Q

What two groups are plastics divided into?

-Lucas M

A

Thermoplastics and thermosetting plastics

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2
Q

What are thermoplastics made of?

-Lucas M

A

Long chain molecules

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3
Q

What holds the long chain molecules together?

-Lucas M

A

Van de waals forces of attraction.

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4
Q

Polythene and acrylic are examples of thermoplastics or thermosetting plastics?

-Lucas M

A

Thermoplastics

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5
Q

What happens to thermoplastics when they are heated?

-Lucas M

A

They soften

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6
Q

Name 2 of the 4 examples of Thermosetting Plastics?

  • Humphrey Marsh
A

GRP
Bakelite
Phenol
Epoxy resin

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7
Q

The process of injection moulding is controlled by what?

  • Humphrey Marsh
A

A central processing unit in a CIM environment

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8
Q

Moulds in injection moulding can be what?

  • Humphrey Marsh
A

Complex and expensive

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9
Q

The long chains of molecules in thermosetting plastics are held together by bonds known as what?

  • Humphrey Marsh
A

Covalent bonds

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10
Q

What type of plastics are flexible?

  • Humphrey Marsh
A

Thermoplastics

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11
Q

In school what can injection moulding be used to make?

-Ssnehnil G

A

A screwdriver

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12
Q

Examples of Thermoplastics

-Ssnehnil G

A 
Acrylic
Polythene
Polypropylene
PET
ABS
PVC
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13
Q

Properties of Thermoplastics

-Ssnehnil G

A

Will soften when heated
Tend to be flexible (more or less)
Impact resistant
Can be coloured

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14
Q

What are Thermosetting plastics made of?

-Ssnehnil G

A

Cross linked chains

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15
Q

Do Thermoplastics have a One shot cycle or Continuous cycle?

-Ssnehnil G

A

Continuous cycle

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16
Q

What can moulds be?

Ed H

A

Complex and expensive

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17
Q

Moulding is what?

Ed H

A

Only suited to volume production

18
Q

What is now highly automated?

Ed H

A

Injection Moulding

19
Q

What do you feed an injection mould?

Ed H

A

Granules

20
Q

What Will soften when heated?

Ed H

A

Thermoplastic

21
Q

What is another name by which the bonds in thermosetting plastics are called excluding covalent bonding?

Caspar Tyser

A

Cross Linked Chains

22
Q

What plastics can only be formed once?

Caspar Tyser

A

Thermosetting Plastics

23
Q

Injection moulding is now controlled by a central processing unit in a …….. environment?

Caspar Tyser

A

CIM (Computer Integrated Manufacture)

24
Q

In ejection moulding where are the granules fed through into the barrel?

Caspar Tyser

A

The Hopper

25
Q

In injection Moulding moulds can be ………?

Caspar Tyser

A

Complex and Expensive

26
Q

What is the force of attraction that hold the long chains of molecules together called?
-Alfie Turner

A

Van Der Waals forces of attraction

27
Q

When do thermoplastics soften?

-Alfie Turner

A

When heated

28
Q

Why would you heat thermoplastics?

-Alfie Turner

A

To enable them to be reformed and moulded

29
Q

List the properties of thermoplastics:

-Alfie Turner

A

Will soften when heated, tend to be flexible, impact resistant and can be coloured

30
Q

Moulds can be complex and …

-Alfie Turner

A

Expensive

31
Q

What does CIM stand for

Oli Shaw

A

Computer integrated manufacture

32
Q

What process would you use to make wheelie bins

Oli Shaw

A

Injection Moulding

33
Q

Phenol is an example of…

Oli Shaw

A

A thermosetting plastic

34
Q

Cross linked chains may also be known as…

Oli Shaw

A

Covalent Bonding

35
Q

How do thermoplastics react to heat

Oli Shaw

A

They soften

36
Q

How do thermosetting plastics react to heat?

- Krystian Shanahan

A

Can withstand high temperatures without losing rigidity

37
Q

What are the properties of melamine?

- Krystian shanahan

A

Can be printed , heat resistant and can be coloured

38
Q

What is required to cause epoxy resin to set ?

- Krystian Shanahan

A

A hardener

39
Q

What property to thermosetting plastics lack?

- Krystian Shanahan

A

Plasticity

40
Q

Which type of plastics are used in compression moulding ?

-Krystian Shanahan

A

Thermoplastics

Design (31 decks)

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