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Comment on:
(a)    PVC is a hard plastic but polyethylene is soft wax-like.

(b)    Addition of sulphur to nutural rubber improves its properties.

(c)    Polypropylene is preferred ever polyethylene.

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162.

What are polyamides? How is nylon-66 synthesised? Give its uses.

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Long Answer Type

163.

Briefly describe the following terms giving one example of each:
(i) Polyolefins
(ii) Polyamides
(iii) Polyesters
(iv) Polydienes

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164.

Could a copolymer be formed in both addition and condensation polymerization or not? Explain with examples.

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Short Answer Type

165.

What is orlon? Give its method of preparation. Give one of its uses.

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166.

Write the equations for the synthesis of:
Polymethyl methacrylate
Also give one important use of it.

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167.

Write the equations for the synthesis of:
Polyacrylonitrile
Also give one important use of it.

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168.

Write the equations for the synthesis of:
Teflon, Also give one important use of it ?

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169.
Write the equations for the synthesis of:
PVC, Also give one important use of it.

PVC (polyvinyl chloride):

It is used in manufacture of rain coats, hand bags, plastic dolls, curtain clothes and vinyl flooring. It is also used as a good insulating material in wires and other electrical goods.