The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. takes place. Dacron is a polymer, which is formed from the condensation polymerization of ethylene glycol and terephthalic acid. Hence, it is a condensation polymer. While Teflon, Polystyrene and Neoprene are addition polymers.