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15.11  Define thermoplastics and thermosetting polymers with two examples of each.

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Thermoplastic polymers are linear or slightly branched chained molecules. It can be repeatedly softened and hardened on heating. Thus they can be modified again and again. Examples- polyethene and polystyrene. These polymers have intermolecular forces of attraction intermediate between elastomers and fibres. Some examples of common thermoplastics are polyethene, polystyrene, polyvinyls, etc.

Thermosetting Plastics are cross-linked and heavily branched molecules, which get hardened during the moulding process. These polymers cannot be reused. For examples bakelite and urea-formaldehyde resin etc.

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