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( Structural unit) In polymer chemistry, a structural unit is a building block of a polymer chain, and related to the repeat unit. It is the result of a monomer which has been polymerized into a long chain. When different monomer are polymerized, a copolymer is formed. It is a routine way of developing new properties for new materials.

Consider this example Take polyethylene terephthalate. The monomers which could be used to create this polymer are ethylene glycol and terephthalic acid

HO-CH₂-CH₂-OH and HOOC-Ph-COOH

In the polymer, there are two structural units, which are -O-CH₂-CH₂-O- and -CO-Ph-CO-

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