Question

Define thermoplastics and thermosetting polymers with two examples of each.

Answer 1

Hey !!

THERMOPLASTIC POLYMERS

These polymers possess intermolecular forces of attraction intermediate between elastomers and fibres. These are linear or slightly branched chain polymers capable of repeatedly softening on heating and hardening on cooling.

Example :- Polythene , Polyproplene , Polystyrene , Polyvinyl chloride etc.

THERMOSETTING POLYMERS

These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross--linking in moulds and again become infusible. These polymers cannot be reshaped.

Example :- Bakelite , Urea-formaldehyde resins etc.

HOPE IT HELPS YOU !

Answer 2

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■ Thermoplastics :

Thermoplastics are the polymers which can be easily softened repeatedly on heating and hardened on cooling. Therefore, it can be used again and again. For example,

• Polythene
• Polyvinyl chloride

■ Thermosetting polymers :

Thermosetting polymers are those which undergo permanent change on heating. They become hard and infusible on heating and cannot be softened again. For example,

• Bakelite
• Melamine-formaldehyde