221.

Draw the repeating structural units of the step growth polymers you would expect to obtain from the following reactions:

Draw the repeating structural units of the step growth polymers you would expect to obtain from the following reactions:

Write  the monomers used for the synthesis of Buna-S.

What are the  cross-linking polymer ?

Give one example of each (i) Homopolymer (ii) co-polymer.

Give one example of natural amide polymer.

Arrange the following in the order of increasing intermolecular forces:
Thermoplastics,  elastomers,    synthetic fibres.

Name a substance used for producing free radicals in chain-growth polymerization.

To which class the following polymers belong:
(i) dacron    (ii) glyptal?

Write the monomers of
(i) Natural rubber,
(ii)  Neoprene,
(iii) Thiokol.