Effects of Dyes and Pigments (original) (raw)

Comprehensive Polymer Science and Supplements, 1989

Abstract

Pigments and dyes are widely used in the colouration of polymer materials for many commercial applications.1 Although they are primarily used to impart colour to the particular polymer and make it attractive to the consumer, except for uses where colour coding is important, pigments and dyes can have a dramatic effect on photostability.2–4 For example, by absorbing and/or screening UV light, pigments can induce a marked protective effect. However, a number of dyes and pigments may also be photoactive and can, therefore, catalyze or accelerate the photochemical breakdown of the polymer. In this section the photostability of the polymer as influenced by the presence of dyes and pigments will be the main directive rather than the stability of the colourant itself. For further information on the latter subject the reader is directed elsewhere.2 It is important to note that in many applications the presence of dyes and pigments can dramatically influence the chemistry of the degradation, oxidation and stabilization processes involved in a polymer and will quite often dominate the overall practical stability of the end-product.5

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