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• W3022757461 abstract "Publisher SummaryPoly(ethylene terephthalate) (PET) was discovered by Whinfield and Dickson in the 1940s. This chapter discusses the various methods of polymerization and fabrication of PET and Poly(ethylene naphthalate) (PEN). Crude 2, 6-naphthalene dicarboxylic acid (2, 6-NDA) can be prepared by oxidizing 2, 6-dialkylnaphthalenes in the liquid phase with molecular oxygen in the presence of a transition metal catalyst and an oxidation promoter. PEN is prepared by a two-step reaction consisting of esterification between 2,6-NDA and glycol to obtain a low-molecular weight esterified compound, and polycondensation reaction of the esterified compound to obtain a higher molecular weight PEN product. In order to obtain high quality PEN, the crude 2, 6-NDA needs to be purified before it is used as a starting material for preparing PEN. The separation of containers made from PET, PEN, and poly (vinyl chloride) can be achieved by identifying the nature of the individual containers by spectroscopic methods. PET can be chemically recycled by alcoholysis. It is believed that a small amount of PEN in PET containers will not hinder PET recycling. the chapter discusses the various properties, special additives, applications, and environmental impact and recycling of PET and PEN." @default.
• W3022757461 created "2020-05-13" @default.
• W3022757461 creator A5052808169 @default.
• W3022757461 date "2008-01-01" @default.
• W3022757461 modified "2023-09-30" @default.
• W3022757461 title "Poly(naphthalates)" @default.
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• W3022757461 doi "https://doi.org/10.1016/b978-081551580-7.50012-2" @default.
• W3022757461 hasPublicationYear "2008" @default.
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