Discussion
Poly(ethylene terephthalate) is made from ethylene glycol and
Answer: D
Correct answer: terephthalic acid
PET is the polyester of ethylene glycol and terephthalic acid, made by esterification with elimination of water. The rigid aromatic ring in the acid raises the melting point and the stiffness well above what an aliphatic diacid would give, which is what makes PET suitable for fibres, films and bottles. Adipic acid with the same glycol would give a soft low-melting polyester.
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