What structural changes are produced during vulcanization of rubber?

What are polyamides?

State how rayon is different from silk?

Name one synthetic polymer containing - CN group. Give its formula.

Which is better material for making PVC pipes a thermosetting plastic or a thermoplastic?

Classify the following polymers as chain growth and step growth polymers:
(i) Buna-S
(ii) Nylon-6,6
(iii) Terylene
(iv) PVC

Mention two uses of Nylon-6, 6.

Define copolymerisation? Give one example. 

Give two examples of polymers that belong to the class of formaldehyde resins.