Polymers

Question 1

LDPE

Answer 1

Properties
Light-weight, low density, low rigidity, low hardness and toughness
Uses
Disposable plastic bags, cling wrap

Question 2

Polyvinylchloride

Answer 2

Properties
Cl side groups causes chain stiffening
Polar C-Cl bonds have strong intermolecular forces, hence it is a hard inflexible polymer
The rigidity of PVC can be adjusted by adding non-volatile plasticisers
Uses
Pipes/guttering/credit cards: since it is hard, brittle/non-flexibe and water resistant
Electrical coating: since it is a hard, brittle/non-flexible and an electrical insulator

Question 3

Polystyrene

Answer 3

Properties
Rigid, hard, lightweight, high crystallinity
Uses
Insulated food packaging: expanded PS is moderately resistant to chemical attack and is a good heat insulator
Car battery cases: since it is an electrical insulator

Question 4

Polytetrafluoroethylene

Answer 4

Properties
Non-stick, heat and chemical resistant, strong and durable (not as much as PVC), low friction (TEFLONS) and flame-resistant
Uses
Non-stick such as on frying pan surfaces
Seals, such as Teflon ‘O’ rings

Question 5

Polyethylene terephthalate

Answer 5

Properties
High strength, rigidity and hardness, low moisture absorption and friction, resistance against acids (not bases)
Uses
Bottles
Containers

Question 6

Nylon-6,6

Answer 6

Properties
Can be moulded or drawn into fibres and used to make plastic
Thermoplastic, strong, elastic, waterproof, highly resistant to attach by insect or fungi
Uses
Clothing, fishing lines