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Question

(a) What are thermoplastics ? Give two examples of thermoplastics.

(b) What are thermosetting plastics? Give two examples of thermosetting plastics.

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Solution

Thermoplastic polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. Hence, they can be modified again and again. Examples include polythene, polystyrene.

Thermosetting polymers are cross-linked or heavily branched polymers which get hardened during the molding process. These plastics cannot be softened again on heating. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins.


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