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Flashcards in Polymers Deck (17):
1

What is the example of a weak force polymer?

Thermo softening polymer

2

Why are thermo softening polymers weak forced?

Thermo softening polymers don't have cross links between chains

3

How awesome are softening polymers weak because they don't have cross links between chains?

The forces between the chains are really easy to overcome so it's easy to melt the plastic. When it cools the polymer hardens into a new shape. You come out these plastics and remould them as tiny as you like.

4

Describe the structure of strong forces in polymers

Some plastics have stronger intermolecular forces between the polymer chains called cross links that hold the chains firmly together

5

What is an example of a strong force polymer?

A thermosetting polymer

6

Why di Thermo softening polymers have strong forces because they have Crosslinks?

These cross links hold the chains together in a solid structure. The Polymer doesn't soften when it's heated. thermosetting polymer is a strong hard and rigid

7

What two factors can effect the properties of a polymer

-The starting materials
- reaction conditions

8

What two types of polythene can be made using different conditions?

-lower density polythene
-high density polythene

9

How is low density polythene made?

Low-density polyethylene is made by heating ethane to about 200°C under high pressure

10

How is high density polythene made?

High density polythene is made at a lower temperature and pressure with a catalyst

11

What is Low density polythene used for and why?

- bags and bottles because it's flexible

12

What is high density polythene made for and why?

What are tanks and drainpipes because it's more rigid

13

What does the plastics melting point to tell you about the forces between the polymer chains?

The higher the melting point the stronger forces holding the polymer chains together

14

What are intermolecular forces between polymer chains called?

Cross links

15

Give two things that can effect the properties of a polymer

The starting materials and the reaction conditions

16

Give the name of the type of molecule that can be joined together to make carbon nanotubes

Fullerenes

17

Describe the structure of a weak forces

Individual tangled chains of polymers held together by weak intermolecular forces are free to slide over each other