Nylon-6,6 is not an example of addition polymer. It is a condensation polymer. This polymer is prepared by the condensation copolymerisation of hexamethylene-diamine and adipic acid under high pressure and at high temperature.
nH2N−(CH2)6−NH2
Hexamethylene‌diamine
+nHOOC−
(CH2)4
Adipic‌acid
−COOH
553K
───────▶
High‌pressure
[−
H
|
N
−(CH2)6−
H
|
N
−
O
∥
C
−(CH2)4−
O
∥
C
−]N All other options are examples of addition polymers i.e polythene, polystyrene and neoprene.