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Question
Differentiate between rubbers and plastics on the basis of intermolecular forces.
Long Answer
Solution
Rubber: In rubber, the polymer chains are held together by weak intermolecular forces. These weak binding forces permit the polymer to be stretched. A few ‘crosslinks’ are introduced in between the chains, which help the polymer to retract to its original position after the force is released as in vulcanised rubber.
Plastics: These are the linear or slightly branched long-chain molecules capable of repeatedly softening on heating and hardening on cooling. These polymers possess intermolecular forces of attraction intermediate between elastomers and fibres.
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