Write the structures of the monomers used for getting the following polymers

(a) Nylon 6,6

(b) Melamine-formaldehyde polymer

(c) Buna-S

(a) Nylon 6,6 is prepared by the condensation polymerization:

Condensation polymers are formed by the repeated condensation

reaction between two bifunctional and trifunctional monomer units

usually with elimination of small molecules like water, alcohol,

ammonia, carbon dioxide, hydrogen chloride, etc. and the process

by which condensation polymers are formed is called

condensation polymerization.

Nylon 6,6 is obtained by the condensation polymerization of two

monomers, i.e., hexamethylenediamine and adipic acid, each

containing two functional groups, with the loss of water molecules.

Thus,

(b) Melamine Formaldehyde is also prepared by the condensation

polymerization of two monomers, i.e., Melamine and formaldehyde.

Thus,

(c) Buna-S is prepared by the addition polymerization:

Addition polymers are formed by the repeated addition of a large

number of same or different monomers possessing double and

triple bonds and the process by which addition polymers are

formed is called addition polymerization.

Buna-s is an addition polymer of two monomers, i.e., 1,3

butadiene and styrene. Thus,