Terylene is a polyester made from terephthallic acid and ethylene glycol. Even though we use two reagents, they undergo esterification to give bis(2-hydroxyethyl) terephthalate (monomer) which then undergo polymerization.
So, is it correct to consider terylene as a copolymer? My reasoning tells that it should be a homopolymer. Same line of reasoning gives nylon, phenol-formaldehyde resin, bakelite — all as homopolymer.
But majority of questions which I go through considered the above polymers as copolymers. What is correct? Are they homopolymers or copolymers?