Question: Poly(ethylene naphthalate) (PEN) has a more rigid structure than PETE (page 428). This rigidity gives PEN increased strength and heat stability, features that are useful

Poly(ethylene naphthalate) (PEN) has a more rigid structure than PETE (page 428). This rigidity gives PEN increased strength and heat stability, features that are useful for food packaging. PEN is made from ethylene glycol and dimethyl naphthalene-2,6-dicarboxylate. Draw the structure of the repeating unit of PEN. Suggest a reason for the greater rigidity of PEN than PETE.

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