When it is being used as a fibre to make clothes, it is often just called polyester. It may sometimes be known by a brand name like Terylene. When it is being used to make bottles, for example, it is usually called PET. In condensation polymerisation, when the monomers join together a small molecule gets lost.
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Asad Khan answered this
Ethyline glycol
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Mishel Jacob answered this
Terphthalic acid and ethylene glycol are the monomers of polyester.
