Luminescence studies of macromolecular behaviour I. Photodecomposition of auramine O in poly(methyl methacrylate)

Graham J Kettle, Ian Soutar

Research output: Contribution to journalArticle

Abstract

The photoreduction of auramine O in PMMA has been studied at concentrations between 10-3 to 10-5 mol kg-1, and over a temperature range of 290 K to 415 K. Whilst the photodecomposition of auramine O precludes its use as a fluorescent probe of relaxation phenomena in PMMA, the rate of the photoreduction process is considerably affected by the physical state of the polymer. A marked decrease in the rate of photoreduction (leading to an apparent negative energy of activation) is observed above Tg. This reduced importance of photochemical decomposition above Tg is a consequence of enhanced radiationless deactivation of the singlet excited state of auramine O through internal rotations, and of the triplet state through internal and external quenching. © 1981.

Original languageEnglish
Pages (from-to)123-130
Number of pages8
JournalPolymer Photochemistry
Volume1
Issue number2
Publication statusPublished - Apr 1981

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