Polymers

Question 1

what is a polymer?

Answer 1

A polymer are all plastics

Question 2

what makes weak forces in polymers?

Answer 2

Weak forces are caused by individual tangled chains of polymers which are free to slide over each other

Question 3

what makes strong forces in polymers?

Answer 3

Strong Forces are caused by cross linked chains, which holds the chains firmly together

Question 4

what are thermosoftening polymers?

Answer 4

Thermosoftening polymers have individual tangled chains which means it is weak. This means that the plastic is easy to melt and when it cools hardens into a new shape, it can do this as many times as you like

Question 5

what is a thermosetting polymer?

Answer 5

Thermosetting polymers have crosslinks, these hold the chains together in a solid structure and does not melt when heated. They are strong, hard and rigid

Question 6

how are low density polymers made and what are they used for?

Answer 6

Low density polythene is made by heating the ethene to about 200’C under high pressure. Its flexible and is used for bags and bottles

Question 7

how are high density polymers made and what are they used for?

Answer 7

High density polythene is made at a lower temperature and pressure (with a catalyst).Its more rigid and is used for water tanks and drainpipes