Poly(ethylene-2,6,-naphthalate) (PEN) is a newly developed polyester. The chemical structure of PEN can be described by replacing the benzene ring in poly(ethyiene terephthalate) (PET) with the stiffer naphthalene ring.

• 聚萘二甲酸乙二酯(PEN)是一种近年来获得较大发展的高性能聚酯材料，其分子结构与聚对苯二甲酸乙二酯(PET)相类似，可看作是由PET链中苯环由刚性更大的萘环所替代的产物。