4. Give examples which indicate that nylon fibres are very strong.
5. Explain why plastic containers are favoured for storing food.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
6. Explain the difference between thermoplastic and thermosetting plastics.
7. Explain why the following are made of thermosetting plastics.
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Answers
Answer:
4 As nylon is a very strong fibre, it is used for making parachutes, rock climbing ropes, fishing nets, seat belts. A nylon thread is actually stronger than steel wire
5 a) the handles of a saucepan are made of thermosetting plastic because it is a bad conductor of heat and does not get heated up while cooking.
(b) Electric plugs/ switches/ plug boards are saucepan is made of thermosetting plastic because it is a bad conductor of electricity.
6The primary physical difference is that thermoplastics can be remelted back into a liquid, whereas thermoset plastics always remain in a permanent solid state
7(a) Saucepan handles-They are made from thermosetting plastics because they are bad conductors of heat and electricity. They do not bend or deform on heating. (b) Electric plugs/switches/plug boards-They are made from thermosetting plastics because they are bad conductors of heat and electricity.