Abstract
Infrared and UV absorption spectroscopy were used to study the photochemical behaviour of poly(butylene naphthalate) (PBN). Based on a comparison with poly(ethylene naphthalate) (PEN) and poly(butylene terephthalate), the mechanism accounting for the formation of the photoproducts responsible for the yellowing and the chain scissioning were proposed. The photochemical oxidation of PBN was shown to be restricted to the surface layer (~5 μm) whilst the photoyellowing affected a thicker layer.
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