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(a) What are thermoplastics? Give two examples of thermoplastics.(b) What are thermosetting plastics? Give two examples of thermosetting plastics.
(a) Plastic is a polymer like a synthetic fibre. The arrangement of units in a plastic can be linear or cross-linked. The plastics which gets deformed easily on heating and can be bent easily are called thermoplastics.
For example, polythene and PVC are thermoplastics. These are used in the manufacturing of toys, combs and different types of containers.
(b) Thermosetting plastics: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics.
For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. It is used to make floor tiles, kitchenware and fire resistant fabrics. It is used to make electrical switches and handles of utensils.
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