Polymers and metals Flashcards
1
Q
When is a polymer formed?
A
Lots of small monomers join together to form a long chain molecule called a polymer.
2
Q
What is high density poly(ethene) used for?
A
Bottles, buckets, water pipes etc.
3
Q
What is low density poly(ethene) used for?
A
plastic bags, clingfilm etc.
4
Q
Describe a low density poly(ethene) polymer.
A
- Branched polymer chains
- Weak forces between chains
- Weak, flexible material
- Low melting point
5
Q
Describe a high density poly(ethene) polymer.
A
- Straight polymer chains
- Chains packed tightly together
- Strong forces between chains
- Strong tough material
- High melting point
6
Q
What does the type of polymer depend on?
A
Temperature of catalyst used during production
7
Q
What is a thermo-softening polymer?
A
A polymer which softens and melts
