Lightfastness, phototendering and fluorescence of 3‐methoxybenzanthrone

Abstract

Studies have been made of the fluorescence quantum yields and lifetimes, the photostability and the phototendering behaviour of 3‐methoxybenzanthrone in nylon 6,6 and in polyester to determine the nature of the primary process responsible for nylon phototendering. The results indicate that in a polar environment such as nylon 6,6 there is an increased probability of dye‐substrate interaction. The results of a study of the fluorescence quenching by amines of varying ionisation potential indicates that the primary process responsible for nylon phototendering may be one of electron abstraction from the substrate.