Question

Polymers can be classified based on molecular forces.

a) Classify the following polymers into elastomers and fibres: Rubber, Nylon 6,6 Buna-S, Terylene

b) What do you mean by thermosetting polymers? Give one example.

Answer 1

a) Elastomers – Rubber, Buna-S Fibres – Nylon 6,6, Terylene b) Thermosetting polymers are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linking in moulds and again become infusible.

These cannot be reused.

e.g. Bakelite, urea-formaldehyde resins