CINNAMATES .6. LIGHT-SENSITIVE POLYMERS WITH PENDENT O-HYDROXYCINNAMATE, M-HYDROXYCINNAMATE AND P-HYDROXYCINNAMATE MOIETIES

In this paper, we outline the photochemical and spectroscopic properti es of a new class of light-sensitive polymers obtained as a result of poly(styrene-co-2-bromoethyl methacrylate) and chloromethylated polyst yrene modification by attaching a pendent hydroxycinnamate group. Thes e specific cinnamates after addition of tertiary amine display charact eristic dual fluorescence. Dual emission is attributed to the presence of two different forms of phenol group. Analysis of the kinetic data of the formation of the ionized form indicates a substantial differenc e between the polymeric and monomeric systems. Simultaneously, the add ition of tertiary amine causes quenching of the singlet excited state. As a result, a sharp decrease in the sensitivity is observed. It is a lso shown that hydroxycinnamates are sensitive in both the neutral and ionized forms of the light-sensitive group. Based on experiments, a k inetic scheme for the processes taking place during irradiation is pro posed.