Polymers

Question 1

If tangled change of polymers can slide over each other, what kind of force holds them together?

Answer 1

Weak intermolecular forces

Question 2

What are strong intermolecular forces called which hold polymer chains firmly together?

Answer 2

Crosslinks

Question 3

What affect do the intermolecular bonds have on the properties of thermo-softening plastic?

Answer 3

Easy to melt because the forces Re easy to overcome meaning they can be easily remoulded

Question 4

What affect do the intermolecular bonds have on the properties of thermo-setting plastic?

Answer 4

The solid cross linked bonds mean it doesn’t soften when heated causing them to be strong, hard and rigid

Question 5

What affects the properties of the polymer?

Answer 5

The starting materials and the reaction conditions

Question 6

What are the two types of polythene that can be made?

Answer 6

Low density polythene and high density polythene

Question 7

How is low density polythene made?

Answer 7

By heating ethene to 200 degrees C under high pressure

Question 8

How is high density polythene made?

Answer 8

By heating ethene to a low temperature with a low pressure and a catalyst

Question 9

What does being flexible make low density polythene perfect for making?

Answer 9

Bottles and plastic bags

Question 10

What does being rigid make high density polythene perfect for making?

Answer 10

Water tanks and drainpipes