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Question:

Arrange the following polymers in increasing order of their intermolecular forces.
(i) Nylon 6, 6, Buna-S, Polythene.
(ii) Nylon 6, Neoprene, Polyvinyl chloride.

Answer:

Polymers can be classified on the basis of molecular forces like vander waals forces, hydrogen bonds and dipole- dipole interactions. They are classified as:

1 Elastomers- They have elastic character and have weak intermolecular forces. Example - natural rubber.

2 Fibres- They have strong hydrogen bond or dipole- dipole interactions between polymers chain. Example - nylon 66.

3 Thermoplastics- They have intermolecular forces intermediate between elastomers and fibres. Example – polythene.

4 Thermosetting polymers- They undergoes permanent change on heating. Example – bakelite.

(i) Buna − S < polythene < Nylon 6, 6

(ii) Neoprene < polyvinyl chloride < Nylon 6


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