Question

Distinguish between the thermoplastic polymer and thermosetting polymer. Give four differences only.
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Answer 1

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.

Answer 2

Thermoplastic polymer:

1)Thermoplastic is lower in molecular

weight, compared to thermosetting plastic.

2)thermoplastics can be remelted back into a liquid.

3)thermoplastics as butter – butter can be melted and cooled multiple times to form various shapes.

4)Thermoplastic polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating.

Thermosetting polymer :

Thermosetting polymer:

1)Thermosetting Plastic is high in molecular weight.

2)thermoset plastics always remain in a permanent solid state.

3)Rigid, brittle, opaque, high strength at elevated temperatures,

4) good chemical resistance, self extinguishing,

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