Polymers Flashcards
0
Q
What are weak forces?
A
Individual tangled chains of polymers, held together by weak intermolecular forces and are free to slide over each other
1
Q
What determines the properties of plastics?
A
The forces BETWEEN the molecules
2
Q
What are strong forces?
A
Some plastics have stronger intermolecular forces between the polymer chains, called crosslinks, that hold the chains firmly together
3
Q
What is low density polythene?
A
Low density (LD) polythene is made by heating ethene to about 200’C under high pressure. It’s flexible and is used for bags and bottles.
4
Q
What is high density polythene?
A
High density (HD) polythene is made at a lower temperature and pressure (with a catalyst). It’s more rigid and is used for water tanks and drainpipes,
