(a) buna-S
An addition polymer is a polymer formed by simply linking the monomers with no co-generation of other products. These polymers are generally made from molecules having carbon-carbon double bonds which means addition polymers are prepared from alkenes. They are also called chain growth polymers. Bakelite is condensation polymer.
Nylon−6 involves the ring opening of caprolactum and then condensation polymerization of aminocaproic acid lead to formation of Nylon−6.
Melamine- formaldehyde polymer is also known as Melmac and it is a condensation copolymer. It is formed by the condensation reaction of melamine and formaldehyde in an alkaline medium.
Buna−S is an addition polymer.
