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71.

Define copolymerisation? Give one example.

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72.

What are polyamides?

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Polyethylene terephthalate (PET) is produced by the polymerization of ethylene glycol and terephthalic acid.

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74.

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

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75.

What structural changes are produced during vulcanization of rubber?

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76.

Mention two uses of Nylon-6, 6.

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77.

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

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78.

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

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79.

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

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80.

State how rayon is different from silk?

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